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Recent Colloquia

Title              :

Do the Fundamental Constants change with Time ?

Speaker         : Prof. Nissim Kanekar, NCRA-TIFR, Pune
Date                : November 28, 2018
Time               : 3:00 PM
Venue            : Lecture Hall-1
Abstract        :

Temporal evolution in low-energy fundamental constants such as the fine structure constant and the proton-electron mass ratio is a generic prediction of theories that attempt to unify the Standard Model of particle physics and general relativity. The exciting possibility of low-energy tests of such unification theories has inspired a number of methods to probe fundamental constant evolution on a range of timescales, from years to billions of years. Astrophysical studies of redshifted spectral lines provide a powerful probe of such putative changes in the low-energy fundamental constants across a large fraction of the age of the Universe. After reviewing the current state of the field, I will describe a technique based on the radio spectral lines of the hydroxyl molecule, and will describe new high-sensitivity results from this method. Finally, I will discuss present limitations of such studies and the improvements that are likely to be possible with the advent of new experimental and observational facilities over the next decade.



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