**************************
                                              *  THEORY GROUP SEMINARS *
                                              *                        * 
                                              **************************



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UPCOMING SEMINARS AT THEORY GROUP:
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                                   * Title  : "Higher signal harmonics, LISA's angular resolution, and dark energy."
 
                                   * Speaker:  Dr.Siddhartha Sinha, Raman Research Inst., Bangalore

                                   * Date   :  09 June, 2008 (Monday)

                                   * Time   :  3:30 p.m.

                                   * Venue  :  Room No. 452 (Theory Seminar Room)
 
                                   *Abstract:  It is generally believed that the angular resolution of the
                                               Laser Interferometer Space Antenna (LISA) for binary supermassive black
                                               holes (SMBH) will not be good enough to identify the host galaxy or galaxy
                                               cluster. This conclusion, based on using only the dominant harmonic of the
                                               binary SMBH signal, changes substantially when higher signal harmonics are
                                               included in assessing the parameter estimation problem. We  show that in a subset
                                               of the source parameter space the angular resolution increases by more than a factor
                                               of 10, thereby making it possible for LISA to identify the host galaxy/galaxy cluster.
                                               Thus, LISA's observation of certain binary SMBH coalescence events could constrain the
                                               dark energy equation of state to within a few percent, comparable to the level expected
                                               from other dark energy missions.


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RECENT SEMINARS AT THE THEORY GROUP :
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                                   * Title  : "CFT and conformal invariant integrals in D dimensions."
 
                                   * Speaker:  Dr. Indrajit Mitra, IIT Kanpur

                                   * Date   :  26 May 2008(Monday)

                                   * Time   :  3:30 p.m.

                                   * Venue  :  Room No. 452 (Theory Seminar Room)

                                   *Abstract:  The general structure of Green functions in D-dimensional
                                               CFT will be discussed. The three-point function in position
                                               space will be determined to the lowest order for several massless
                                               field theories with dimensionless coupling. The evaluation wil
                                               use the operator algebraic method of calculating massless Feynman integrals.


                                          


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                                   * Title  :  "Local entropy increase of hydrodynamics from local area increase of a black hole horizon."
 
                                   * Speaker:  Prof. Gautam Mandal, TIFR Theory Group

                                   * Date   :  23 May 2008(Friday)

                                   * Time   :  3:30 p.m.

                                   * Venue  :  Room No. 452 (Theory Seminar Room)

                                 


                                   PLEASE NOTE THE CHANGE OF SEMINAR DAY

 
                                                        
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                                    * Title  : "Higher dimensional autonomous and nonautonomous integrable mappings"
 
                                   * Speaker:  Prof.R. Sahadevan,Ramanujan Institute for Advanced Study in Mathematics, University of Madras

                                   * Date   :  May 20  (Tuesday)

                                   * Time   :  3:30 p.m.

                                   * Venue  :  Room No. 452 (Theory Seminar Room)

                                   *Abstract:  Recent work on the investigation of completely integrable fourth 
                                               order autonomous mappings w(n+4) = F(w(n),w(n+1),w(n+2),w(n+3))is 
                                               presented. After reviewing the various working definitions of complete 
                                               integrability of differential, differential - difference and pure 
                                               difference equations, we derive the conditions on the function F for which 
                                               the fourth order mapping is symplectic and admitts two independent 
                                               integrals of motion ensuring complete integrability in the sense of 
                                               Liouville. A systematic method is presented to construct explicitly two or 
                                               three independent integrals of the above mapping. Also, the question of 
                                               deautonomizing the obtained autonomous integrable equations is briefly discussed.


                                          


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                                  * Title  :  "A Fresh look at the U(1) problem and its solution"
 
                                   * Speaker:  Prof.Gautam Bhattacharya, Theory Division, SINP

                                   * Date   :  28 April 2008 (monday)

                                   * Time   :  3:30 p.m.

                                   * Venue  :  Room No. 452 (Theory Seminar Room)

                                   *Abstract:   Contrary to the usual belief that the Adler anomaly for the 
                                                divergence of the U(1) axial current destroys the chiral symmetry, the 
                                                correct anomaly equation that includes the fermionic zero modes is, in 
                                                fact, a consequence of rigid chiral symmetry. The effective low energy 
                                                action including the anomaly term must therefore treat the ninth 
                                                pseudoscalar meson as a Goldstone boson in the chiral limit with its zero 
                                                mode acting as the generator of U(1) action on vacuum. With the soft 
                                                breaking of the chiral symmetry by quark mass all pseudoscalar mesons 
                                                develop mass, but the ninth one gets an extra contribution from the the 
                                                anomaly term when the zero mode disappears. The mass of the ninth 
                                                pseodo-Goldstone boson turns out to follow the Witten-Veneziano relation.

                                          


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                                   * Title  : "Towards twisted standard model in Moyal space-time"."
 
                                   * Speaker:  Prof. T. R. Govindarajan, IMSC, Chennai

                                   * Date   :  10.03.2008 (Monday)

                                   * Time   :  3:30 p.m.

                                   * Venue  :  Room No. 452 (Theory Seminar Room)

                                   *Abstract:  Novel formulation of spontaneously broken gauge theories in
                                               Noncommutative geometry and some implications for standard model physics
                                               will be discussed.


                                          


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                                   * Title  : "Lightest supersymmetric neutral higgs in the extra-dimensional scenario."
 
                                   * Speaker:  Swarup Kumar Majee, Harish-Chandra Research Institute.   

                                   * Date   :  07.03.2008 (Friday)

                                   * Time   :  3:30 p.m.

                                   * Venue  :  Room No. 452 (Theory Seminar Room)




                                          PLEASE NOTE THE CHANGE OF SEMINAR DAY



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               On Monday, next week, there will be a series of two talks by two eminent cosmologists. The details 
               of the programme is given below:
         
                                  


                                   * Title  : "Seeing the high energy universe"
 
                                   * Speaker:  Prof. Subir Sarkar, University of Oxford, U.K..

                                   * Date   :  18.02.2008 (Monday)

                                   * Time   :  2.30 p.m.

                                   * Venue  :  Room No. 452 (Theory Seminar Room)


                                  

                              ****************************************  
                              *    TEA BREAK : 3:30 p.m. - 4:00 p.m.  *
                              *****************************************



                                      
                                   * Title  : "T. B. A."
 
                                   * Speaker:  Prof .Tarun Souradeep, IUCAA, India.

                                   * Date   :  18.02.2008 (Monday)

                                   * Time   :  4:00 p.m.

                                   * Venue  :  Room No. 452 (Theory Seminar Room)



****************************************************************************************************************************************


                                    * Title  : "Higher Derivative Corrections in String Theory."
 
                                   * Speaker:  Dr. Anirban Basu, IAS, Princeton

                                   * Date   :  21.02.2008 (Thursday)

                                   * Time   :  4:15 p.m.

                                   * Venue  :  Room No. 452 (Theory Seminar Room)

                                   *Abstract:   I will discuss how higher derivative corrections in string theory modify
                                                general relativity at small distance scales. These corrections are 
                                                strongly constrained by supersymmetry and various string dualities.



                                          PLEASE NOTE THE CHANGE OF SEMINAR TIME.

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                                   * Title  : "Hawking Radiation and Covariant Divergence Anomalies"
 
                                   * Speaker:  Prof. Rabin Banerjee, S. N. Bose Center.

                                   * Date   :  21.01.2008 (Monday)

                                   * Time   :  3.30 p.m.

                                   * Venue  :  Room No. 452 (Theory Seminar Room)


************************************************************************************************************************************************                                   

                                   * Title  : "Neutrino oscillation under gravity "
 
                                   * Speaker:  Dr.Monika Sinha, Saha Institute of Nuclear Physics.

                                   * Date   :  17.01.2008 (Thursday)

                                   * Time   :  3.30 p.m.

                                   * Venue  :  Room No. 452 (Theory Seminar Room)



*******************************************************************************************************************************************************                         


                                   
                                   * Title  : " Coulomb dissociation as an indirect method in nuclear astrophysics "
 
                                   * Speaker:  Dr.Rajdeep Chatterjee, Padova University. & INFN, Padova 

                                   * Date   :  04.01.2008 (Friday)

                                   * Time   :  3.30 p.m.

                                   * Venue  :  Room No. 452 (Theory Seminar Room)

                                   * Abstract: A reliable description of element formation in terms of stellar burning chains
                                              (eg. the pp-chain) and cycles (eg. the CNO-cycle) involves an accurate
                                              knowledge of nuclear reaction cross sections at very low collision energy
                                              corresponding to the temperatures relevant at the astrophysical sites under
                                              consideration. In this talk we shall describe how the Coulomb dissociation
                                              of 9Li on a heavy target could be used to calculate the 8Li(n,gamma)9Li
                                              reaction rate, which has consequences on the abundances of elements
                                              with A>12. We shall also elaborate on the power of the  Coulomb dissociation
                                              method to gain structure information about nuclei far away from the stability line.




				       
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                                   * Title  : "Associated Higgs Production in CP-violating supersymmetry:
                                               probing the `open hole' at the Large Hadron Collider"
 
                                   * Speaker:  Priyotosh Bandyopadhyay, Harishchandra Research Institute 

                                   * Date   :  28.12.2007 (Friday)

                                   * Time   :  3.30 p.m.

                                   * Venue  :  Room No. 452 (Theory Seminar Room)


				        PLEASE NOTE THE CHANGE OF SEMINAR DAY

**********************************************************************************************************************************************************8
 
                                   * Title  : "Review of PVLAS experiment and its implications in search of the axion"
 
                                   * Speaker:  Sandip Biswas, University of Hawaii at Manoa   

                                   * Date   :  20.12.2007 (Thursday)

                                   * Time   :  3.30 p.m.

                                   * Venue  :  Room No. 452 (Theory Seminar Room)


				        PLEASE NOTE THE CHANGE OF SEMINAR DAY
 
                                 
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                                   * Title  : "Collective oblate rotation of atomic nuclei"
 
                                   * Speaker:  Prof.Phil Walker,University of Surrey.  
                                
                                   * Date   :  17.12.2007 (Monday)

                                   * Time   :  3.30 p.m.

                                   * Venue  :  Room No. 450 


                                       PLEASE NOTE THE CHANGE OF SEMINAR DAY AND VENUE


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                                  *  Title:  "Majorana phases and renormalization group evolution in neutrino mixing"
 
                                  * Speaker:  Prof. Probir Roy, DAE Raja Rammana Fellow, SINP.
                                
                                   * Date  :  14.12.2007 (Friday)

                                   * Time  :  3.30 p.m.

                                   * Venue  : Room No. 452 (Theory Seminar Room)
       
                             
***********************************************************************************************************************************************************************


                                  *  Title :   "Noncommutative space-times of Lie algebra type "
 
                                  * Speaker:   Dr. Zoran Skoda (Rudjer Boskovic Institute, Zagreb)

                                  * Date   :   11.12.2007 (Tuesday)

                                  * Time   :   3.30 p.m.

                                  * Venue  :   Room No. 452 (Theory Seminar Room)
                              
                                  * Abstract:  We consider the noncommutative deformations of coordinate
                                               algebras where the commutation relations between noncommutative coordinates are
                                               linear in coordinates.Such deformations in some models correspond to small scale
                                               deformations of space-time. Most works relate to special cases, corresponding to particular
                                               Lie algebras. In this talk I will focus mainly on lessons and computations which hold for a
                                               general n-dimensional Lie algebra. For example, it is important to consider the momenta of
                                               multiparticle systems (deformed addition of momenta).
                                               For that one needs to know how the momenta operators act on tensor products; knowledge of the representation
                                               is not enough here, one needs to know the nontrivial deformed coproduct for momenta. In symmetric 
                                               ordering this coproduct is computed by a formula related to the Baker-Campbell-Hausdorff formula.


                                                         PLEASE NOTE THE CHANGE OF SEMINAR DAY
                            

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                                  *  Title:   "On the Geometrical tachyon and Universal open string tachyon "
 
                                  * Speaker:   Dr.Kamal L. Panigrahi, IIT Guwahati 

                                  * Date   :   07.12.2007 (Friday)

                             
**************************************************************************************************************************************************** 
                                  * Title  :   "On the Giant Magnon in NS5-brane background" 
                                                 
                                  * Speaker:   Dr. Rashmi R. Nayak,  CQUeST, Seoul, S. Korea

                                  * Date   :   06.12.2007 (Thursday)


**************************************************************************************************************************************************** 


                                  *  Title:   "Messages from the hidden sector and  the mu-Bmu problem "
 
                                  * Speaker:   Dr.Tuhin Roy, Institute for Theoretical Science,University of Oregon.

                                  * Date   :   05.12.2007 (Wednesday)

                             
****************************************************************************************************************************************************
                                                     

                                  *  Title: "Electromagnetic Splittings of meson isomultiplet masses in LQCD"

                                  * Speaker: Dr. Subhasish Basak, Indiana University,  Bloomington

                                   * Date  : 15.11.2007 (Thursday)

                              
                                   PLEASE NOTE THE CHANGE OF SEMINAR TIME AND VENUE.


***************************************************************************************************************************************

                                    

                                   * Title   :  "T. B. A."

                                   * Speaker :  Dr. Ishwaree P. Neupane, Canterbury University (Christchurch, New Zealand).

                                   * Date    :  15 October, 2007 (Monday) 

                              
                                  

*****************************************************************************************************************************
                  

                                   * Title   :  "Initial Thermal Effects on Inflation."

                                   * Speaker :  Dr. Kaushik Bhattacharya, ICM, UNAM, Mexico.

                                   * Date    :  11 October, 2007 (Thursday) 

 
                                    In standard inflationary paradigm the temperature of the inflatons do not play any significant role. But 
                                    it may so happen that inflation started when the inflatons were in thermal equilibrium with the rest of the
                                    plasma and the temperature of the inflaton can have some observable effects on the CMBR spectrum. The tensor 
                                    perturbations during inflation can also be affected by the initial thermal effects, when inflation began, and
                                    consequently this effect will be seen in the polarization data from WMAP. In this talk we will discuss how the 
                                    initial thermal condition of the universe can affect the temperature and polarization patterns of the CMBR sky.


**************************************************************************************************************************************************

                                   * Title   :  "Phase transitions in asymptotically AdS black holes and gauge theory duals"

                                   * Speaker :  Tanay Kr. Dey, Institute of Physics, Bhubaneswar

                                   * Date    :  17 September 2007 (Monday) 


********************************************************************************************************************************************

                                   * Title   :  "The Unbounded Euclidean Action in Quantum Gravity"

                                   * Speaker :  Dr. Arundhati Dasgupta, University of New Brunswick, Canada

                                   * Date    :  13 August 2007 (Monday) 


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                                   * Title   :  "COSMOLOGICAL ASPECTS OF GENERALISED BRANS-DICKE THEORY"

                                   * Speaker :  Prof.Lambodar P Singh, Utkal University

                                   * Date    :  27 June 2007 (Wednesday) 

                                  
********************************************************************************************************************************************                                  
                                  


                                   * Title   :  "Null Singularities and their Gauge Theory Duals"

                                   * Speaker :  Prof. Sumit R. Das, Univ. of Kentukey, USA.

                                   * Date    :  22 June 2007 (Friday) 

                                 

**********************************************************************************************************************************************
                                   
                                   * Title   :  "Time Variability of Active Galactic Nuclei"

                                   * Speaker :  Ritaban Chatterjee, Boston University, USA.

                                   * Date    :  4 June 2007 (Monday) 

                                   * Abstract:  Active Galactic Nucleus (AGN) is the central region of a galaxy which is
                                                much brighter than the rest of the galaxy. AGNs are among the most
                                                spectacular objects in the sky. They look like a star in an image but many
                                                are as bright as ten thousand galaxies over some or all of the
                                                electromagnetic spectrum. Time variability of the radiation they emit is
                                                one of the distinctive properties of certain class of AGNs called
                                                "blazars", characterized by jets of extremely energetic, magnetized plasma
                                                flowing outward at very close to the speed of light. Time variability at a 
                                                single wavelength and also comparison of time variability across different
                                                wavelengths may be used to infer the structure as well as the physical
                                                conditions inside the jets. We have monitored the brightness of two
                                                blazars - between 1996 and 2006 at three wavebands (X-rays, optical and
                                                radio). We calculated the power spectrum of the brightness variation and
                                                correlation between different wavelengths. 
                                               
                                                I will start with an introduction to AGNs which will include their
                                                observational properties, general consensus about their structure and
                                                basic physical mechanisms involved. I will discuss the remaining mysteries
                                                about AGNs those are still illuding the astronomers. The rest of my talk
                                                will be about how our group is trying to use time variability, both
                                                theoretically and observationally, to draw inference about the radiation
                                                mechanisms and dynamics of these systems. We hope that these will
                                                eventually answer some of the remaining questions.

**************************************************************************************************************************************
                                   
                                    * Title   :  "Anisotropies in the Cosmic Microwave Background"

                                   * Speaker :  Suchetana Chatterjee,  University of Pittsburgh, USA.

                                   * Date    :  28 May 2007 (Monday)
                                 
                                   * Abstract:  The tiny fluctuations in the Cosmic Microwave Background (CMB) happen to
                                                be the strongest probe in constraining Cosmology. The origin of these
                                                fluctuations can be from different physical mechanisms and at different
                                                epochs in the evolution history of the universe.  The anisotropies in the
                                                CMB that are generated at the time of recombination are called the Primary
                                                anisotropies while the ones that are generated due to  interaction of the
                                                CMB with matter in the later universe are
                                                collectively called Secondary anisotropies. Current and future CMB
                                                experiments are potentially capable of detecting these anisotropies at
                                                different angular scales. I will briefly discuss the origin of these
                                                anisotropies and the prospects for detecting them. I will start with a
                                                theoretical introduction of these fluctuations  and summarise the
                                                results of the WMAP satellite, which spectacularly fulfilled the
                                                theoretical predictions. I will conclude with the state of the art CMB
                                                experiments and how they can be used to extract parameters of Physical
                                                Cosmology.


*******************************************************************************************************************************************

                                      
                                   * Title   :  "The Plancherel formula for SU(1,1) "

                                   * Speaker :  Prof. Debabrata Basu, I.I. T. Kharagpur.

                                   * Date    :  30 April,  2007 (Monday)
                                

**********************************************************************************************************************************************


                                   * Title   :  "Cosmic Star Formation History & Deep Field X-ray Studies"

                                   * Speaker :  Prof. Pranab Ghosh, T. I. F. R., Mumbai

                                   * Date    :  4 May,  2007 (Friday)
                                  
                                   * Abstract:  We explore the X-ray diagnostics of cosmic star formation
                                                history that have been possible with recent deep-field X-ray
                                                studies. We summarize the status of our understanding of the
                                                X-ray evolution of galaxies. We discuss lessons learnt from
                                                number-count plots, as also the criteria for distinguishing
                                                between normal/straburst galaxies and AGNs in deep X-ray
                                                surveys. We indicate the correlations between emissions in
                                                X-ray and other wavebands from star-forming galaxies, which
                                                reinforce the value of X-rays as a diagnostic of star formation.

**********************************************************************************************************************************************

                                   * Title   :  "Almost the supersymmetric standard model from the $Z_6'$ orientifold"

                                   * Speaker :  Prof. David Bailin, Univ. of Sussex, U.K.

                                   * Date    :  23 April 2007 (Monday)

                                   * Time    :  3.30 p.m.

                                   * Venue   :  Room No. 452 (Theory Seminar Room)

*********************************************************************************************************************************************
   
                        
                                   * Title   :  "Assorted Results of Field Theory from Lattice"

                                   * Speaker :  Prof. Asit De, Theory Division, SINP

                                   * Date    :  9 April 2007 (Monday) and 13 April 2007 (Friday)                                  

                                   * Abstract:  I discuss results that come naturally from the lattice regularization of
                                                quantum field theories but are unknown to most people outside the lattice
                                                community. I have personally been involved in some of the works I shall
                                                discuss. I believe these results illustrate some of the issues of quantum
                                                field theories when viewed more generally than just perturbatively.


*******************************************************************************************************************************************



                                   * Title   :  "Probing the dark matter halo of the Galaxy with rotation curve and
                                                 dwarf satellites' dynamics"

                                   * Speaker :  Prof. Pijushpani Bhattacharjee, Theory Division, SINP

                                   * Date    :  26 March 2007 (Monday)

                                   * Abstract:  The rotation curve (i.e., the circular rotation speed as a function of the
                                                Galactocentric distance) has been traditionally used to probe the density
                                                distribution of the dark matter (DM) in the Galaxy. The rotation curve
                                                data are, however, available only out to Galactocentric distances of ~ 20
                                                kiloparsec, whereas the size (radius) of the DM halo of the Galaxy is
                                                thought to extend well beyond this. In this talk I discuss some results of
                                                our recent work in which we probe the DM halo of the Galaxy on larger
                                                distance scales by exploiting the dynamics of the observed dwarf
                                                spheroidal satellites of our Galaxy (the Milky Way) combined with the
                                                available rotation curve data. In particular, we estimate (or place limits
                                                on) the three main measurable parameters characterizing the phase-space
                                                structure of the DM halo of the Galaxy, namely, the velocity dispersion (>
                                                or ~ 400 km/s) and the density (~ 0.3 GeV/cm^3) of the DM particles in the
                                                solar neighbourhood, and the extent (> or ~ 150 kpc) of the DM halo. These
                                                estimates or limits are obtained by using a novel method in which the
                                                total gravitational potential of the Galaxy including its DM halo (within
                                                which the dwarf satellites move) is calculated by including the
                                                gravitational coupling between the visible and the dark comoponents of the
                                                Galaxy in a fully self-consistent manner. These results may have important
                                                implications for both direct as well as indirect DM detection experiments. 
                                
                                  

*******************************************************************************************************************************************



                                   * Title   :  "Parity nonconservation in atoms and anapole moment"

                                   * Speaker :  Dr. Ananya Bhattacharya, Presidency College

                                   * Date    :  12 February, 2007 (Monday)

                                 
******************************************************************************************************************************************

  
                                   * Title   :  "Impossibility of BETA--Equilibrated Quark Matter at the Core of a
                                                 Compact Newborn Neutronstar with Moderately Strong Magnetic Field"

                                   * Speaker :  Dr. Sutapa Ghosh, Kalyani University

                                   * Date    :  22 January, 2007 (Monday)
                                  

********************************************************************************************************************************************
                                      
                                   * Title   :  "The Why,If and But of Quasi-hermitian Quantum Mechanics"

                                   * Speaker :  Prof.Frederik G. Scholtz, University of Stellenbosch, South
                                                Africa

                                   * Date    :  12 January, 2007 (Friday)

*******************************************************************************************************************************************
                                  
                                    * Title   :  "Matrix Models  Dualities in the Collective-Field Formulation"

                                   * Speaker :    Prof. Ivan Andric, Rudjer Boskovic Institute, Zagreb, Croatia

                                   * Date    :    10 January, 2007 (Wedesday)

                                  
 
********************************************************************************************************************************************

                                   * Title   :  "Classical Topology and Quantum Entanglement"

                                   * Speaker :  Dr. V.V.Sreedhar, IIT, Kanpur

                                   * Date    :  2 January, 2007 (Tuesday)

                                 
 

********************************************************************************************************************************************
                                    * Title   : "p-Toying with Strings"

                                    * Speaker : Prof. Debashis Ghoshal, HRI, Allahabad.

                                    * Date    : 29 December, 2006 (Friday)
                                  
                                    * Abstract: We review recent developments on a family of toy models for 
                                                string theory. We suggest interpreting these models as lattice
                                                discretisation, and an empirical limit relating to the usual 
                                                strings, as the continuum limit (in the sense of the renormalisation
                                                group). Physics of models on Bethe lattices tie up nicely with 
                                                known mathematical results in support of our argument.


                                     PLEASE NOTE THE CHANGE OF SEMINAR DAY
                 
********************************************************************************************************************************************

                                   * Title   :    "Study of Disappearance of Flow, Thermalization and Related
                                                   Phenomena in Heavy-Ion Collisions."

                                   * Speaker :    Dr. Aman Sood, BBSB Engineering College, Panjab University. 
 
                                   * Date    :    26 December, 2006 (Tuesday)
                                  
                                   * Abstract:    The aim of present study is to explore the dynamics at the energy of
                                                  vanishing flow. The collective transverse flow being the most sensitive
                                                  observable has been subjected to intensive investigation with regard to
                                                  the mass and model ingredients. We also aim to study nuclear dynamics at
                                                  the balance energy as well as other phenomena occurring at the energy of
                                                  vanishing flow.


********************************************************************************************************************************************           
                                   * Title   :  "Thermal Operator Representation for finite temperature Feynman graphs"

                                   * Speaker :  Prof. Ashok Das, Uneversity of Rochester, Rochester.

                                   * Date    :  21 December, 2006 (Thursday)

                                  
                                                    
*****************************************************************************************************************************************                                                   
                                   
                                   * Title   :    "The Cluster Decomposition Principle in Quantum Field Theory - II."

                                   * Speaker :    Prof. Samir Mallik, Theory Division, S.I.N.P.

                                   * Date    :    11 December, 2006 (Monday)

                                   * Abstract:    Starting from Cluster expansion in (classical) Statistical
                                                  Mechanics, I shall describe how a similar idea assumes the status of 
                                                  a principle in Quantum Field Theory. We shall see how this principle
                                                  makes the scattering of three or more particles inevitable. In the
                                                  end I shall tell you a story about superstition.
                                                                     

*******************************************************************************************************************************************

                                   * Title   :    "A universal sector of field/string configurations in pp-waves
                                                   and D-branes."

                                   * Speaker :    Dr. Partha Mukhopadhyay, DAMTP, Cambridge.
 
                                   * Date    :    8 December, 2006 (Friday)


*******************************************************************************************************************************************
                              

                                   * Title   :    "The Cluster Decomposition Principle in Quantum Field Theory - I."

                                   * Speaker :    Prof. Samir Mallik, Theory Division, S.I.N.P.

                                   * Date    :    4 December, 2006 (Monday)

                                   * Abstract:    Starting from Cluster expansion in (classical) Statistical
                                                  Mechanics, I shall describe how a similar idea assumes the status of 
                                                  a principle in Quantum Field Theory. We shall see how this principle
                                                  makes the scattering of three or more particles inevitable. In the
                                                  end I shall tell you a story about superstition.

*******************************************************************************************************************************************
                               

                                   * Title   :    "Variations in the neutron star properties within the field
                                                   theoretical model."

                                   * Speaker :    Dr. Shashi K. Dhiman, Department of Physics,
                                                  H.P. University, Shimla

                                   * Date    :    16 November, 2006 (Thursday)

                                  
                                   * Abstract:    The different parametrizations of field theoretical model
                                                  are obtained in such a way that they differ only in
                                                  the behaviour resulting for the density dependence of
                                                  symmetry energy coefficient and the equation of state of
                                                  dense matter. These parametrizations are employed 
                                                  to study the variations in the properties of neutron stars
                                                  which composed of nucleons, hyperons, and leptons.  
                                                  We find that the values of the maximum neutron star mass
                                                  $M_{max}$ and the radius $R_{1.4}$ of neutron star with the canonical
                                                  mass $1.4M_sun$ vary  in the range of $1.4 - 2.1M_sun$ and $11.5 - 14.1\text{ km}$,
                                                  respectively.  Our results show strong correlations between the $M_{max}$ and
                                                  $R_{1.4}$  indicating that the value of $R_{1.4}$ should be at least $12.5\text{ km}$
                                                  according to the currently available observations for maximum neutron star mass.
                                  
*******************************************************************************************************************************************



                                   * Title   :   "PDF and scale uncertainties of DY distributions in ADD and RS
                                                  models at hadron colliders."

                                   * Speaker :    M.C.Kumar, S.I.N.P., Kolkata.

                                   * Date    :    30 October, 2006 (Monday)

                                   * Abstract:    Drell-Yan process (dilepton production) can be used for the Extra
                                                  Dimensional search at LHC and TEVATRON.  The recent NLO results of various
                                                  DY distributions in ADD and RS models have shown to what extent the first
                                                  order QCD corrections contribute to the process.  However, these
                                                  observables are associated with uncertainties coming out of parton
                                                  distribution functions(PDF) and scale variations that are independent of
                                                  the model chosen.  For extra dimension searches it is important to
                                                  quantify these uncertainties, how small or large they may be, as they
                                                  affect both the ED signal and the back ground.  The scale dependence gets
                                                  reduced in going from LO to NLO by around 2.75 times for the mu_F
                                                  variation 0.5 Q < mu_F < 1.5 Q.  The experimental error on PDF also has
                                                  been studied for few DY observables.



******************************************************************************************************************************************* 
                                  * Title    :    Modulli contribution to the rare $B_s \to \mu^+ \mu^-$ decay

                                  * Speaker  :    Dr.Prasanta Kumar Das, IMSC, Chennai

                                  * Date     :    27th Oct,2006.(Friday)     
                                
                                  * Abstract :    Radion, the 55-component of the Randall-Sundrum graviton, is
                                                  required to fix the size of the extra dimension. It possesses a lot of
                                                  interesting phenomenological signatures
                                                  that can be tested/discovered in direct collider search or through
                                                  indirect precission measurements or in certain heavy meson decay. Here we
                                                  analyse the rare $B_s \to \mu^+ \mu^-$  decay in the light of radion whose
                                                  SM branching ratio is found to be two order smaller than the present experimental
                                                  bound. Using this bound, we obtain constraints on radion mass and it's vev.

                                  
                                 
                                     

*******************************************************************************************************************************************

                                 
                                   * Title   :    "Criterion for dynamical chiral symmetry breaking"

                                   * Speaker :    Dr.Indrajit Mitra, S.I.N.P., Kolkata.

                                   * Date    :    26 October, 2006 (Thursday) :       

                                  

                                     
                                   

*******************************************************************************************************************************************

                                  
                                 
                                 

                                   * Title   :    "Hadronic Atoms In Effective Field Theory"

                                   * Speaker :    Udit Raha, Helmholtz Institute, Bonn

                                   * Date    :    16 October, 2006 (Monday)
                                  
                                   * Abstract:    Here, I shall report our investigation of the various properties of the so-called
                                                  hadronic atoms, in particular, the kaonic hydrogen, the pionic deuterium and the
                                                  kaonic deuterium. These serve as wonderful probes to measure QCD dynamics at threshold
                                                  that reveal valuable information on the mechanism of strong interactions at very low
                                                  energies. Recent high precision experiments by the DEAR/SIDDHARTA collaboration and
                                                  at PSI have necessitated the need for the inclusion of the isospin breaking corrections
                                                  in the Deser-Trueman formula in order to achieve a more accurate extraction of 
                                                  quantities, such as the s-wave scattering lengths from experimental data. We derive 
                                                  a ``modified'' Deser-type relation in a model-independent way, to include next-to-leading
                                                  order isospin breaking corrections using the framework of low-energy effective field
                                                  theory (EFT). In particular, we report very large isospin breaking corrections for the
                                                  kaonic hydrogen, due to unitary cusp effects. Also, large isospin breaking effect emerge
                                                  in pionic deuterium which could explain the bulk of the discrepancy between experimental
                                                  data for pionic hydrogen and deuterium, respectively.  Furthermore, for the case of the 
                                                  pionic and kaonic deuterium, using EFT we investigate the possibility of extraction of 
                                                  the s-wave $\pi N$ and $\bar K N$ scattering lengths from experimental data. I shall 
                                                  also present the first proper estimate of the of the electromagnetic low energy constant
                                                  (or quark-photon coupling), $f_1$ which occurs in the chiral expansion of nucleon mass
                                                  and in the elastic pion-nucleon scattering.

*******************************************************************************************************************************************
                               

                                   * Title   :    "g -2 of muon and room for new physics"

                                   * Speaker :    Kalyanbrata Chatterjee, Theory Division, SINP.

                                   * Date    :    10 October, 2006 (Tuesday)
                                  
            
*******************************************************************************************************************************************

                                   * Title   :   "Weak Isolated Horizons"

                                   * Speaker :    Ayan Chatterjee, Theory Division, SINP.

                                   * Date    :    27 September 2006, Wednesday. 

                                   

********************************************************************************************************************************************
    
                                   * Title   :   "Oscillator on K\"{a}hler space"

                                   * Speaker :    Pulak Ranjan Giri, Theory Division, SINP.

                                   * Date    :    25 September 2006, Monday.  


********************************************************************************************************************************************
                           
                                 

                                   * Title   :   "\eta -meson production in pp collision"

                                   * Speaker :    Subhrajyoti Biswas  , Theory Division, SINP.

                                   * Date    :    18 September 2006, Monday.

                                  

********************************************************************************************************************************************
                                   * Title   :   "Lattice QCD with Dynamical Quarks"

                                   * Speaker :    Jyotirmoy Maiti, Theory Division, SINP.

                                   * Date    :    15 September 2006, Friday.

                                  

********************************************************************************************************************************************                              

                                   * Title   :   "Exact partition function of SU(m|n) supersymmetric Haldane-Shastry
                                                  spin chain."

                                   * Speaker :    Nilanjan Bandyopadhaya, Theory Division, SINP.

                                   * Date    :    11 September 2006, Monday.

                                                                                           

********************************************************************************************************************************************
                                  
                                    
                                   * Title   :   "Quasinormal modes of Gauss-Bonnet black hole :
                                                  Study of low lying and asymptotic modes." 
                                                 
                                   * Speaker :    Sayan Chakrabarti, Theory Division, SINP.

                                   * Date    :    8 September 2006, Friday
                                
                                   * Abstract:    We obtain the quasinormal modes for tensor perturbations of Gauss-Bonnet
                                                  black holes in $d=5, 7, 8$ dimension and vector perturbations in $d = 5,
                                                  6, 7$ and $8$ dimension using third order WKB formalism. The tensor
                                                  perturbation for black holes in $d=6$ is not considered because of the
                                                  fact that it is unstable to tensor mode perturbations. For the uncharged
                                                  Gauss-Bonnet black hole, the real part of the QN frequency increases as
                                                  the Gauss-Bonnet coupling ($\alpha'$) increases for both tensor and vector
                                                  perturbations. The imaginary part first decreases upto a certain value of
                                                  $\alpha'$ and then increases with $\alpha'$ for both tensor and vector
                                                  perturbations. For larger values of $\alpha'$, the QN frequencies for
                                                  vector perturbation differs slightly from the QN frequencies for tensorial
                                                  one. It has also been shown that as $\alpha' \to 0$, the quasinormal mode
                                                  frequency for tensor and vector perturbation of the Schwarzschild black
                                                  hole is obtained.  We have also calculated the quasinormal spectrum of the
                                                  charged Gauss-Bonnet black hole for tensor perturbations and has found
                                                  that the real oscillation frequency increases is increased and the damping
                                                  rate, i.e. the imaginary part of the frequency falls with the increase of
                                                  the charge. The asymptotic qnm for Higher Dimensional Schwarzschild black
                                                  hole with a Gauss-Bonnet correction will also be discussed.
********************************************************************************************************************************************
                                                                                                        
                                   * Title   :   "Role of antikaon condensate in r-mode instability"

                                   * Speaker :    Debarati Chatterjee, Theory Division, SINP.

                                   * Date    :    4 September 2006, Monday.

                                    
********************************************************************************************************************************************

                                   * Title   :   "Modified Altarelli Feruglio Model of $A_4$ Symmetry:
                                                  Nonzero $\theta_{13}$ and CP Violation"

                                   * Speaker :    Biswajit  Adhikary, Theory Division, SINP.

                                   * Date    :    1 September 2006, Friday.

                                  
********************************************************************************************************************************************
                                   
                                   * Title   :   "From Noncommutative Phase Space to Hilbert Space"

                                   * Speaker :    B. Muthukumar, Theory Division, SINP.

                                   * Date    :    28 August 2006, Monday.

                                  

********************************************************************************************************************************************
                                   

                                   * Title   :   " Dynamical Generation of Gauge Group in Matrix Model.".
                                                                                
                                   * Speaker :    Dr.Subrata Bal ,School of Theoretical Physics, Dublin Institute for
                                                  Advanced Studies, Ireland.
                                                                                
                                   * Date    :    May 8, 2006. (Monday)                                   
                                                                      
                                   * Abstract:    The dynamics of k coincident D-branes in string theory is described
                                                  effectively by U(k) Yang-Mills theory at low energy. While these
                                                  configurations appear as classical solutions in matrix models, it was
                                                  not clear whether it is possible to realize the k =/= 1 case as the
                                                  true vacuum. The massive Yang-Mills-Chern-Simons matrix model has
                                                  classical solutions corresponding to all the representations of the
                                                  SU(2) algebra, and provides an opportunity to address the above issue on a
                                                  firm ground. We investigate the phase structure of the model, and find in
                                                  particular that there exists a parameter region where O(N) copies of the
                                                  spin-1/2 representation appear as the true vacuum, thus realizing a
                                                  nontrivial gauge group dynamically
                                   

*******************************************************************************************************************************************   

                                   * Title   :   "Black Holes in a Non-commutative Space-Time Theory".
                                                                                
                                   * Speaker :    Dr. Supriya Kar, University of Delhi 
                                                                                
                                   * Date    :    April 28, 2006. (Friday)                                   
                                   
                                  


********************************************************************************************************************************************              


                                   * Title   :   "On Euclidean and Noetherian Entropies in AdS Space".
                                                                                
                                   * Speaker :    Suvankar Dutta, H.R.I, Allahabad.
                                                                                
                                   * Date    :    April 17, 2006. (Monday)                                   
                                   
                                   * Abstract:    We examine the Euclidean action approach, as well as that of Wald,
                                                  to the entropy of black holes in asymptotically $AdS$ spaces.
                                                  From the point of view of holography these two approaches
                                                  are somewhat complementary in spirit and it is not obvious why they
                                                  should give the same answer in the presence of arbitrary higher
                                                  derivative gravity corrections. We study the case of the $AdS_5$
                                                  Schwarzschild black hole in the presence of different higher
                                                  derivative corrections studied in the literature, including the
                                                  Type IIB $R^4$ term, and find that the two approaches agree in every case.
                                                  Finally, we give a general way to understand why these two approaches
                                                  should be equivalent.




********************************************************************************************************************************************




                                   * Title   :   "Loop Variables: A Proposal for a Background Independent
                                                  Approach to String Theory".
                                                                                
                                   * Speaker :    Prof. Balachandran Sathiapalan, I.M.Sc., Chennai.
                                                                                
                                   * Date    :    March 27, 2006. (Monday)  


                                  

********************************************************************************************************************************************



                                   * Title   :   "QCD with two flavours of dynamical chirally improved quarks : First results" 
                                                                                
                                   * Speaker :    Dr .Pushan Majumdar, Institut f\"ur Theoretische Physik
                                                  Westf\"alische Wilhelms-Universit\"at, M\"unster  . 
                                                                                
                                   * Date    :    March 6, 2006. (Monday)  
                                  
                                   * Abstract:   Treating Ginsparg-wilson type fermions dynamically in lattice QCD
                                                 simulations is a challenging task. The hope is to be able to approach
                                                 smaller pion masses and to eventually reach physical situations. The price
                                                 to pay is substantially higher computational costs. Here we discuss first
                                                 results of a dynamical implementation of the so-called Chirally Improved
                                                 fermions, a Dirac operator that obeys the GW-contition
                                                 approximately. The simulation is for two species of mass degenerate quarks
                                                 on lattices with spatial sizes upto 1.55 fm.



******************************************************************************************************************************************                                                                                                                                   

 
                                   * Title   :   "Quark recombination and hadron elliptic flow" 
                                                                                
                                   * Speaker :    Dr. Subrata Pal, Tata Inst. of Fundamental Research, Mumbai. 
                                                                                
                                   * Date    :    March 1, 2006. (Wednesday)  
                                  
                                   * Abstract:    A deconfined phase of quark-gluon plasma is expected to be formed at the
                                                  early stage in relativistic heavy ion collisions (RHIC). The elliptic flow
                                                  of hadrons that characterize the early collective dynamics provides a key
                                                  probe to the early stage of matter formed at RHIC. Large elliptic flow
                                                  for hadrons has been observed in noncentral heavy ion collision at RHIC.
                                                  Further, the elliptic flow for mesons and baryons exhibits different
                                                  structure. I will show that the quark recombination model for hadronization
                                                  can explain the elliptic flow systematics for various hadron species at
                                                  RHIC. A straightforward prediction of the recombination formalism, that the
                                                  elliptic flow for different hadrons scale with the number of quarks that
                                                  comprise the hadron, will be presented. The sensitivity of the quark number
                                                  scaling for the elliptic flow to the relative role of anisotropies in the
                                                  phase space densities versus anisotropies in the effective emission volume
                                                  will be discussed.



********************************************************************************************************************************************


  
                                   * Title   :   "KABRU and QCD-strings" 
                                                                                
                                   * Speaker :    Prof. N. D. Hari Dass, IMSc. Chennai. 
                                                                                
                                   * Date    :    Feb 20, 2006. (Monday)  
                                  
                                   * Abstract:    In this talk I shall describe the simulations carried out on KABRU, the
                                                  Linux Teraflop supercomputer built at IMSc for lattice simulations which
                                                  have revealed the presence of string-like structure in QCD.Our data is
                                                  accurate enough to distinguish between different string models and our
                                                  data converge strongly to the expectations from Nambu-Goto string. The
                                                  theoretical implications of the simulation results will also  be
                                                  discussed.


********************************************************************************************************************************************


                                    
                                   
                                 This Lecture will be in two parts. One on 30.01.06 and the next on 31.01.06.


                                  
                                   * Title   :    "SU(N) chiral gauge theories on the lattice" (I) and (II)
                                                                                
                                   * Speaker :    Prof. Maarten Golterman, San Francisco State University, USA. 
                                                                                
                                   * Date    :    Jan. 30, 2006. (Monday) and Jan 31, 2006 (Tuesday)                

                                           
                                   * Abstract:    We describe how an SU(N) chiral gauge theory can be put on
                                                  the lattice using non-perturbative gauge fixing.  In particular,
                                                  we explain how the Gribov problem is dealt with.  Our
                                                  construction is local, avoids doublers, and weak-coupling
                                                  perturbation theory applies at the critical point which defines
                                                  the continuum limit of our lattice chiral gauge theory.

                                    
                                      PLEASE NOTE THE CHANGE OF SEMINAR DAY


********************************************************************************************************************************************


                                   * Title    :    "Lattice QCD with domain-wall fermions."
                                                                                
                                   * Speaker  :    Prof. Maarten Golterman, San Francisco State University, USA. 
                                                                                
                                   * Date     :    Jan. 27, 2006. (Friday).
                                                                                         
                                   * Abstract :    In the first part of this talk I give a brief overview of Lattice
                                                   QCD.  I then go on to describe Lattice QCD with domain-wall
                                                   fermions, with which very good chiral symmetry can be obtained.
                                                   It turns out that the quality of chiral symmetry is a dynamical
                                                   issue, related to Anderson localization.
                                     
                                     
                                       PLEASE NOTE THE CHANGE OF SEMINAR DAY

********************************************************************************************************************************************
                                  
                                   
          
                                   * Title   :   "Charged black holes in modified dilaton-axion gravity."
                                                                                
                                   * Speaker :    Dr. Sourav Sur, IOP, Bhubaneshwar.
                                                                                
                                   * Date    :    Jan. 24, 2006. (Tuesday).
                                                                                
                                  
********************************************************************************************************************************************
                                                                

                                   * Title   :   "A Predictive See-Saw Scenario for EDM."
                                                                                
                                   * Speaker :    E.J. Chun, Korea Institute for Advanced Study . 
                                                                                
                                   * Date    :    Jan. 18, 2006. (Wednesday).
                                                                                
                                  

******************************************************************************************************************************************** 

                                   * Title   :   "Neutrino shortcuts in the extra dimension: from 
                                                  oscillations to causality."
                                                                                
                                   * Speaker :    Dr.Heinrich Paes, University of Hawaii at Manoa, USA. 
                                                                                
                                   * Date    :    Jan. 16, 2006. (Monday).
                           
                                                                                      

********************************************************************************************************************************************
                                  
                                   * Title   :   "Some Aspects of Relativistic Sagnac Effect."
                                                                                
                                   * Speaker :    Dr. Biplab Raychaudhuri, North Begal Univ.
                                                                                
                                   * Date    :    Jan. 12, 2006. (Thursday).
                                                                                
                                   * Abstract:    The talk will discuss some problems in relativistic
                                                  Sagnac effect and their solutions. A resolution of the
                                                  long standing problem of Ehrenfest paradox (1909) will
                                                  be offered thereby solving the problem of existence of
                                                  two formulae for Relativistic Sagnac delay. It will
                                                  also be discussed how Sagnac effect provides a tool to
                                                  find the relativistic transformation equation from
                                                  inertial frame to rotating frame. Finally Sagnac phase
                                                  shift in curved spacetime will be discussed. The
                                                  appearance of arbitrarily large Sagnac phase shift
                                                  under certain condition will  be discussed.

                                     
                                        PLEASE NOTE THE CHANGE OF SEMINAR DAY

********************************************************************************************************************************************
                                  

                                   * Title   :    "Radiative decay of B meson in Supersymmetry without R-parity."
                                                                                
                                   * Speaker :    Rishikesh Vaidya, TIFR, Mumbai. 
                                                                                
                                   * Date    :    Jan. 02, 2006. (Monday).                                                                                                                         
                                   * Abstract:    We shall discuss the inclusive rare decay B--> X_s + gamma, in the
                                                  framework of Supersymmetry without R-parity. This apparently innocuous
                                                  decay mode has an interesting history of calculation within SM itself,
                                                  and a next to leading log (NLL) calculation was completed only about
                                                  a year ago, after a decade and a half of efforts from the several groups.
                                                  The reason behind such concerted efforts in this direction is because,
                                                  this is among the few golden modes where the entire calculation can be
                                                  done within the frame-work of RG-improved perturbation theory and the
                                                  non-perturbative corrections are suppressed by at least two powers of
                                                  m_b. The calculation thus is relatively free from scale, scheme and
                                                  non-perturbative uncertainties that plague the non-leptonic decay modes. 
                                                  The NLL number is in beautiful agreement with the experimental results 
                                                  from CLEO, BELLE, BABAR and ALEPH. So this can be an excellent tool to 
                                                  constrain the huge parameter space of new physics models. We shall
                                                  confront the case of Supersymmetry without R-parity that brings in a lot
                                                  of intricacies and explore the resulting bounds. If time permits, we 
                                                  shall also briefly discuss, a 'distant cousin' of B--> X_s + gamma, the
                                                  so called neutron electric dipole moment, again in the framework of
                                                  R-parity Violation (RPV). It leads to bounds on interesting class of 
                                                  contributions - a combination of soft bilinear and trilinear RPV 
                                                  couplings, that have not been popularly appreciated.
                                                                                

                         
*******************************************************************************************************************************************


                                    
                                    * Title   :  "Noncommutative spacetime and exact bosonization 
                                                  of nonrelativistic fermions."

                                    * Speaker :   Prof. Gautam Mandal, TIFR, Mumbai.
                                                                                
                                    * Date    :   Dec. 30, 2005. (Friday).
                                                                                                                   

********************************************************************************************************************************************

                                    * Title   :  "The geometry of special relativity"

                                    * Speaker :   Anirban Ghosh, IIT KGP.
                                                                                
                                    * Date    :   Dec. 29, 2005. (Thursday).
                                                                                
                                   

********************************************************************************************************************************************


                                    * Title   :  "The unpredictable paybacks of fundamental
                                                  science : The global positioning system."
                                                                                             
                                    * Speaker :   Anirban Gangopadhyay, IIT KGP.
                                                                                
                                    * Date    :   Dec. 27, 2005. (Tuesday). 
                                                                                
                                   
                              

********************************************************************************************************************************************



                                   * Title   :    "A time-dependent perturbative study of the
                                                   shallow water hydraulic jump."
                                                                                
                                   * Speaker :    Arnab K. Ray, HRI, Allahabad.. 
                                                                                
                                   * Date    :    Dec. 26, 2005. (Monday).
                                                                                                                         
                                   * Abstract:    In the long-standing fluid dynamical problem of the hydraulic jump, an
                                                  equation for a time-dependent linearised perturbation about the steady
                                                  shallow water solution has been derived, and this has been
                                                  used to carry out a linear stability analysis of the flow on a plane. In
                                                  doing so, a closeness has been discerned between the respective dynamic
                                                  perturbation equations of the incompressible shallow water flow and the
                                                  compressible spherically symmetric astrophysical
                                                  accretion flow. A close correspondence has also been revealed between the
                                                  form of the perturbation equation and the metric of an acoustic white
                                                  hole. Viscosity lends greater stability to the system when the
                                                  perturbation is treated as a standing wave in the sub-critical region, and
                                                  using a consequent time scale, a physical basis has been given for the
                                                  formation of the hydraulic jump.


                          
********************************************************************************************************************************************                                   


                                   * Title   :    "Strange Quark Matter and Astrophysical Observations"

                                   * Speaker :    Monika Sinha, RRI, Bangalore. 
                                      
                                   * Date    :    Dec. 19, 2005. (Monday).
                               
                                  

*******************************************************************************************************************************************


     
                                   * Title   :    "Information Measures for Inferring Quantum Mechanics"
                                                                                
                                   * Speaker :    Dr. Rajesh R. Parwani, University of Singapore, Singapore
                                                                                
                                   * Date    :    Dec. 14, 2005. (Wednesday).
                                                                                
                                   
********************************************************************************************************************************************



                                   * Title   :    "Lattice Study of Quarkonia in a Gluonic Plasma."
                                                                                
                                   * Speaker :    Dr. Saumen Datta, Brookhaven National Lab., USA. 
                                                                                
                                   * Date    :    Dec. 12, 2005. (Monday).
                                                                                                                  
                                   * Abstract:    At very high temperatures (and/or density), such as
                                                  in the very early universe, strongly interacting matter
                                                  is expected to exist in a `deconfined' state of quarks and
                                                  gluons rather than mesons and baryons. Creating this state
                                                  and studying the physics of this state is the goal of relativistic 
                                                  heavy ion collision experiments. 

                                                  The behavior of heavy quarkonia in such hot and dense matter
                                                  has been a subject of extensive study, since heavy quarkonia,
                                                  in particular $J / \psi$, are among the most important probes 
                                                 of such a medium.
                                                 
                                                 In this talk, I will discuss how one can extract properties
                                                 of in-medium quarkonia from lattice QCD, and present some results 
                                                 of such a study for a purely gluonic medium.


********************************************************************************************************************************************
                       


                                  * Title   :   "Measuring the deviation from maximal atmospheric 
                                                 neutrino mixing at INO".

                                  * Speaker :    Prof. Probir Roy, TIFR, Mumbai.

                                  * Date    :    December 8 (Thursday)

                                 
********************************************************************************************************************************************


                                    
                                   * Title   :   "A Microscopic Shell Model Description of the $^{17}$F(p,$\gamma$)
                                                  $^{18}$Ne Radiative Capture Reaction."
                                                                                
                                   * Speaker :    Dr. Rajdeep Chatterjee, GANIL, France.
                                                                                
                                   * Date    :    Dec. 5, 2005. (Monday).
                                                                                                                  
                                   * Abstract:    Radiative capture reactions play a significant role in nuclear astrophysics 
                                                  being one of the important processes in stellar nucleosynthesis. In this talk 
                                                  we shall describe the proton capture reaction $^{17}$F(p,$\gamma$)$^{18}$Ne,
                                                  which plays an important role in  nova nucleosynthesis, with the recently 
                                                  developed shell model embedded in the continuum (SMEC). Those aspects of  
                                                  SMEC which imply the modification of the closed quantum system eigenvalues 
                                                  and eigenfunctions  and attempts to put the theory of nuclear structure 
                                                  and reactions on the same footing will be discussed. The spectra of $^{18}$Ne, 
                                                  calculated in pure shell model (closed quantum system approximation) and 
                                                  with SMEC (open quantum system approximation) shall be presented. The same 
                                                  Hamiltonian will be used to calculate the radiative proton capture cross 
                                                  sections from both the ground ($5/2^+$) and excited ($1/2^+$) states of $^{17}$F, 
                                                  with proper antisymmetrized wave functions being used in both initial and 
                                                  final states. The astrophysical S-factor for E1, M1 and E2 transitions to 
                                                  all the relevant bound states of $^{18}$Ne  will be presented. We shall also 
                                                  present a qualitative description of possible scenarios in nova 
                                                  nucleosynthesis due to our calculated $^{17}$F(p,$\gamma$)$^{18}$Ne reaction
                                                  rate at some typical stellar temperatures.


                                  
*******************************************************************************************************************************************

                                   

                                   * Title   :   "TeV scale Leptogenesis, \theta_13 and doubly charged
                                                  particles at LHC" .
                                                                                
                                   * Speaker :    Arunansu Sil, Bartol Research Institute, Univ. of Delaware, USA.                                                           

                                   * Date    :    Oct. 19, 2005 (Wednesday)
                                                                                
                                   
********************************************************************************************************************************************


                                   * Title   :    "$\eta$ meson production in nucleon - nucleon collision :
                                                  probing the negative parity $S_{11}$  baryonic resonances".
                                                                                
                                   * Speaker :    Subhrajyoti Biswas, S.I.N.P., Kolkata
                                                                                
                                   * Date    :    Oct. 18, 2005 (Tuesday)
                                                                                

********************************************************************************************************************************************

                                  
                                   * Title   :    "Hadronic physics, multiquark states from Lattice QCD"
                                                                                
                                   * Speaker :     Dr. Nilmani Mathur, Jefferson National Lab., USA.
                                                                                
                                   * Date    :     6 Oct., 2005 (Thursday)
                                                                                                                  

                                       PLEASE NOTE THE CHANGE OF SEMINAR DAY
                                      

                                  
********************************************************************************************************************************************

                                   
                                   * Title   :   "Scattering of Glue by Glue on the Lightcone Worldsheet"
                                                                                
                                   * Speaker :    Dr. Dipankar Chakrabarti, Univ. of Florida, USA.
                                                                                
                                   * Date    :    5 Oct, 2005 (Wednesday)
                                                                                                                  
                                   * Abs.    :    We present the light-cone gauge calculation of one-loop on-shell
                                                  scattering amplitudes which violate helicity conservation. We regulate the
                                                  infrared divergences by discretizing the p^+ integration and employ a
                                                  novel ultraviolet regulator that is natural for light-cone worldsheet
                                                  description of planar Feynman diagrams. We show that these regulators give
                                                  the known results for the helicity non-conserving one-loop amplitudes. We
                                                  enumerate the counterterms that must be included to give Lorentz
                                                  covariant results to this order and show that they can be described
                                                  locally in the light-cone worldsheet formulation of the sum of planar diagrams. 
                                  

                                    PLEASE NOTE THE CHANGE OF SEMINAR DAY


********************************************************************************************************************************************
                                 
                                  
                                   * Title   :  "Asymptotic quasinormal modes of $d$-dim. Schwarzschild black hole with    
                                                 Gauss Bonnet correction".
                                                                                
                                   * Speaker :   Sayan Chakrabarti, S.I.N.P., Kolkata
                                                                                
                                   * Date    :   Sep. 15, 2005 (Thursday).
                                                                                                                   
                                   * Abstract:   QNMs are classical perturbations with non-vanishing damping
                                                 propagating in a given gravitational background subject to specific boundary
                                                 conditions. We obtain an analytic expression for the highly damped
                                                 asymptotic QN frequencies in dimension $ d \geq 5 $ , of the d-dimensional
                                                 Schwarzschild black hole with a correction coming from the Gauss-Bonnet
                                                 term, which appears in string derived models of gravity. The analytic
                                                 expression is obtained when the coupling in front of the Gauss-Bonnet term
                                                 in the action is small. Although there are several similarities of this
                                                 geometry with that of the Schwarzschild black hole, the asymptotic QN
                                                 frequencies are different. In particular, the real part of the frequencies
                                                 for this class of single horizon black holes is not proportional to $\log(3)$.



                                    PLEASE NOTE THE CHANGE OF SEMINAR DAY

********************************************************************************************************************************************


              
                                   * Title   :   "Active Galaxies, Thermal Conduction and  Gas in Galaxy Groups and Clusters".
                                                                                
                                   * Speaker :    Suparna Raychaudhury, R.R.I, Bangalore.
                                                                                
                                   * Date    :    Sep. 13, 2005 (Tuesday).
                                                                                                                  
                                   *Abstract :    Galaxy clusters harbour large amounts of hot gas which make
                                                  them luminous in X-rays. The temperature of this gas is mostly
                                                  thought to be determined by the gravitational potential of
                                                  the dark matter. Recent detailed X-ray observations have 
                                                  also determined its density, thus entropy, and found evidence of 
                                                  non-gravitational heating of this gas. We first study the cluster
                                                  gas in hydrostatic equilibrium with the background dark matter potential
                                                  to put a benchmark on the amount of excess 
                                                  entropy/energy required over and above gravity to reconcile with X-ray observations. 
                                                  Then, we study the role of active galaxies and thermal conduction in clusters 
                                                  to explain these excess entropy observations at large radii
                                                  ($r>0.5r_{\rm \scriptscriptstyle vir}$). 
                                                  AGNs are assumed to deposit energy via buoyant bubbles which expand as they rise 
                                                  in the cluster atmosphere and do mechanical work on the ICM. Such bubbles
                                                  have been recently observed by {\textit {Chandra}}. On inclusion of thermal
                                                  conduction, we find that the resulting profiles of temperature, density and
                                                  entropy are consistent with observations. We deduce the energy required to explain
                                                  the entropy observations as a function of mass of groups and clusters.
                                                  The inferred relation is seen to be nonlinear and can be viewed as an
                                                  extension of a similar relation between the black hole mass and the galactic
                                                  halo mass that holds on smaller scales.

                              
                                  PLEASE NOTE THE CHANGE OF SEMINAR DAY


********************************************************************************************************************************************




                                   * Title   :   "Investigation of Phase Structure in 1+1d Lattice $\phi^4$ Theory".
                                                                                
                                   * Speaker :    Jyotirmoy Maiti, S.I.N.P., Kolkata
                                                                                
                                   * Date    :    Sep. 12, 2005 (Monday).
                                                                                                                  

********************************************************************************************************************************************



                                 

                                   * Title   :   "Aspects of Self-Adjoint Extension".
                                                                                
                                   * Speaker :    Pulak Ranjan Giri, S.I.N.P., Kolkata
                                                                                
                                   * Date    :    Sep. 8, 2005 (Thursday).
                                                                                
                                  
                                      PLEASE NOTE THE CHANGE OF SEMINAR DAY

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                                   * Title   :  "Kalb- Ramond Field Interactions in RS- I Model".
                                                                                
                                   * Speaker :   Ayan Chatterjee, S.I.N.P., Kolkata
                                                                                
                                   * Date    :   Sep.5, 2005 (Monday).
                                                                                                                  
                                   * Abstract:   Electromagnetic and (linearized) gravitational interactions of the
                                                 Kalb-Ramond (KR) field, derived from an underlying ten dimensional
                                                 heterotic string in the zero slope limit, are studied in a five
                                                 dimensional background Randall-Sundrum I spacetime with standard model
                                                 fields confined to the visible brane having negative tension. The warp
                                                 factor responsible for generating the gauge hierarchy in the Higgs
                                                 sector is seen to appear inverted in the KR field couplings, when
                                                 reduced to four dimensions. This leads to dramatically enhanced
                                                 rotation, {\it far beyond observational bounds}, of the polarization
                                                 plane of electromagnetic and gravitational waves, when scattered by a
                                                 homogeneous KR background. Possible reasons for the conflict between
                                                 theory and observation will be discussed 




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                                   * Title   :   "Effect of Hyperons on Neutron Star Properties".
                                                                                
                                   * Speaker :    Debarati Chatterjee, S.I.N.P., Kolkata
                                                                                
                                   * Date    :    Sep. 1, 2005 (Thuraday).
                                                                                
                                   
                                      PLEASE NOTE THE CHANGE OF SEMINAR DAY

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                                 * Title   : "Dual families of Noncommutative quantum systems"
                                
                                 * Speaker :  Dr.Biswajit Chakraborty, S.N. Bose Centre, Kolkata.
               
                                 * Date    :  August 29, 2005 (Monday)
                                                                                  
                                 * Abstract:  We demonstrate how a one-parameter family of interacting non-commuting Hamiltonians,
                                              which are physically equivalent, can be constructed in non-commutative quantum mechanics.
                                              This construction is carried out exactly (to all orders in non-commutative parameter) 
                                              and analytically in two dimensions for a free particle and a harmonic oscillator moving
                                              in a constant magnetic field $B$. We discuss the significance of Seiberg-Witten map in the
                                              context. It is shown for harmonic oscillator potential that an approximate duality,
                                              valid in the low energy sector, can be constructed between the interacting commutative
                                              and non-interacting non-commutative Hamiltonian. This approximation holds to order $1/B$
                                              and is therefore valid in the case of strong magnetic fields and weak Landau-level mixing.

                                            

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                                   * Title   :   "Aspects of Physics on Non- Commutative Spaces ".
                                                                                
                                   * Speaker :    B. Muthukumar, S.I.N.P., Kolkata
                                                                                
                                   * Date    :    August 25, 2005 (Thursday).
                                                                                
                                                                    

                                        PLEASE NOTE THE CHANGE OF SEMINAR DAY


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                                   * Title   :   "Soft breaking of $L_\mu-L_\tau$ symmetry:
                                                  Light neutrino spectrum and Leptogenesis".
                                                                                
                                   * Speaker :    Biswajit Adhikary, S.I.N.P., Kolkata
                                                                                
                                   * Date    :    August 22, 2005 (Monday).                                                                                                                 

                
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                                 * Title   :   "Probing the response of quark gluon plasma ".
                                
                                 * Speaker :    Purnendu Chakraborty, S.I.N.P., Kolkata
                                                                                
                                 * Date    :    August 18, 2005 (Thursday).
                                                                                
                                                                                                                

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                                 * Title   : "Neutrino masses in R-parity violating supersymmetric models"
                                
                                 * Speaker :  Dr. Subhendu Rakshit, SINP, Kolkata.
               
                                 * Date    :  August 11, 2005 (Thursday)
                                                                                  
                                 * Abstract:  We review different contributions to the neutrino masses in the context of
                                              R-parity violating supersymmetry. We will comment on the neutrino spectrum
                                              expected in a scenario where R-parity violation is invoked in an Abelian
                                              horizontal symmetry framework.
                                 
        
                                         PLEASE NOTE THE CHANGE OF SEMINAR DAY
 


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                                * Title   : "Is Entanglement Entropy Proportional to Horizon Area?."
             
                                * Speaker :  Dr. Saurya Das, Univ. of Lethbridge, Alberta, CANADA
            
                                * Date    :  August 8, 2005 (Monday)
                                            
                                * Abstract:  Several pieces of argument suggest that the entropy of a black hole is proportional
                                             to its horizon area (as opposed to its volume). Although there have been various 
                                             attempts to understand black hole entropy from underlying microscopic states, these
                                             are neither complete nor always satisfactory. There has been an alternative proposal
                                             that entanglement between matter degrees of freedom inside and outside the horizon
                                             gives rise to this entropy. Even for scalar fields in flat spacetime in their
                                             ground state, this `entanglement entropy' turns out to be proportional to the area 
                                             bounding the region being traced over. We examine this proposal carefully and show 
                                             that when excited states of the field are taken into account, deviations for the area
                                             law can result.


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                                 * Title  :  "Primordial Magnetic fields from variable alpha theories".

                                 * Speaker :  Dr.Nirmalya Barat, SUNY, USA.
               
                                 * Date    :  August 1, 2005 (Monday)
               
                                
    
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                                * Title  :  "Gauge, Higgs and Matter Unification in Extra Dimensions"
              
                                * Speaker :  Dr. S. Nandi, Oklahoma State University, USA. .
               
                                * Date    :  July 27, 2005 (Wednesday)
                
                               

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                                * Title  :  "On Energy Conditions in effective Loop Quantum Cosmology."
              
                                * Speaker :  Golam Mortuza Hossain, IMSc., Chennai. .
              
                                * Date    :  July 25, 2005 (Monday)