Neutrino Mass, Leptogenesis and FIMP Dark Matter in a ${\rm U}(1)_{\rm B-L}$ Model

Understand

The Standard Model (SM) is inadequate to explain the origin of tiny neutrino masses, the dark matter (DM) relic abundance and also the baryon asymmetry of the Universe.

• In this work to address all the three puzzles, we extend the SM by a local U$(1)_{\rm B-L}$ gauge symmetry, three right-handed (RH) neutrinos for the cancellation of gauge anomalies and two complex scalars having nonzero U$(1)_{\rm B-L}$ charges.
• All the newly added particles become massive after the breaking of U$(1)_{\rm B-L}$ symmetry by the vacuum expectation value (VEV) of one of the scalar fields $\phi_H$.
• The other scalar field $\phi_{DM}$, which does not have any VEV, becomes automatically stable and can be a viable DM candidate.