Speaker
Description
We consider a unified framework accommodating the dark matter and the matter-antimatter asymmetry of the universe, through a minimal addition of right-handed neutrinos and a singlet scalar φ to the Standard Model. The framework assumes an asymmetry in the dark sector and connects it with the asymmetry in the visible sector. It turns out that the out-of-equilibrium decay of heavier right-handed neutrinos to the visible sector (LH) and to the dark sector (heavy N_R decays to lightest RH-neutrino as dark matter candidate via φ scalar) is consistent with the relic density observations of both the sectors. The model allows for a wide range of dark matter masses, from keV to GeV scale, and is also able to provide for the active neutrino masses through Type-I
seesaw mechanism. Thus, the model explains the lepton asymmetry, dark matter abundance and neutrino masses all in a next-to-minimal framework.
| Session | Astroparticle Physics and Cosmology |
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