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Past Seminar

Title              :

Dark Matter from Freeze-In via the Neutrino Portal

Speaker         : Mathias Becker, TU, Dortmund
Date                : November 14, 2018
Time               : 1:45 PM
Venue            : Room 3307
Abstract        :

We investigate a minimal neutrino portal dark matter (DM) model where a right-handed neutrino both generates the observed neutrino masses and mediates between the SM and the dark sector, which consists of a fermion and a boson. In contrast to earlier work, we explore regions of the parameter space where DM is produced via freeze-in instead of freeze-out motivated by the small neutrino Yukawa couplings in case of O(TeV) heavy neutrinos. For a non-resonant production of DM, its energy density is independent of the DM mass. Assuming a democratic coupling structure we find M_N > 10 TeV and achieve a lower bound on the DM mass > 5 TeV. For the resonant production of DM, we find that it can be produced via freeze-in or freeze-out even with couplings of O(10^-5).



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