Lepton number asymmetry via inflaton decay in a modified radiative seesaw model

Abstract

We propose a non-thermal scenario for the generation of baryon number asymmetry in a radiative neutrino mass model which is modified to realize inflation at the early Universe. In this scenario, inflaton plays a crucial role in both generation of neutrino masses and lepton number asymmetry. Lepton number asymmetry is firstly generated in the dark matter sector through direct decay of inflaton. It is transferred to the lepton sector via the dark matter annihilation and then converted to the baryon number asymmetry due to the sphaleron interaction. All of the neutrino masses, the baryon number asymmetry and the dark matter are intimately connected to each other through the inflaton.

26 pages, 3 figures

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• Leptogenesis in a neutrino mass model coupled with inflaton
• Inflation connected to the origin of $CP$ violation
• Inflation and DM phenomenology in a scotogenic model extended with a real singlet scalar
• An extension of the SM based on effective Peccei-Quinn Symmetry
• Radiative neutrino mass model with degenerate right-handed neutrinos
• $\mu \to e\gamma$ in a supersymmetric radiative neutrino mass model
• Low scale leptogenesis in a model with promising $CP$ structure
• Leptogenesis via Inflaton Mass Terms in Non-Minimally Coupled Inflation
• Symmetry restoration due to preheating and lepton number asymmetry