The XXIX International Conference on Supersymmetry and Unification of Fundamental Interactions (SUSY 2022)

Imprint of the Seesaw Mechanism on Feebly Interacting Dark Matter and the Baryon Asymmetry

1 Jul 2022, 17:40

20m

Main Auditorium (Conference Centre “Karolos Papoulias”)

Dark Matter and Astroparticle Physics Particle cosmology: Theory and Experiment

Speaker

Dr Rishav Roshan (Kyungpook National University)

Description

We show that the type-I seesaw, responsible for generating the light neutrino mass, itself is capable of accommodating one of the three right handed neutrinos as a freeze-in type of dark matter (DM) where the required smallness of the associated coupling is connected to the lightness of the (smallest) active neutrino mass. It turns out that (a) the non-thermal production of DM having mass $\leq \mathcal{O}(1)$ MeV (via decays of $W, Z$ bosons and SM Higgs) consistent with relic density as well as (b) its stability determine this smallest active neutrino mass uniquely $\sim {\mathcal{O}}(10^{-12})$ eV. On the other hand, study of flavor leptogenesis in this scenario (taking into account the
latest neutrino data and Higgs vacuum stability issue) fixes the scale of two other right handed neutrinos.