Leptogenesis in a neutrino mass model coupled with inflaton

TL;DR

This paper presents a novel leptogenesis mechanism via inflaton decay in a radiative neutrino mass model, enabling baryon asymmetry generation with lighter right-handed neutrinos and low reheating temperatures.

Contribution

It introduces a new leptogenesis scenario leveraging inflaton decay to produce non-thermal right-handed neutrinos, bypassing the need for resonance effects.

Findings

Baryon asymmetry can be generated without resonance effects.

The scenario allows for lighter right-handed neutrinos than traditional bounds.

Effective at low reheating temperatures.

Abstract

We propose a scenario for the generation of baryon number asymmetry based on the inflaton decay in a radiative neutrino mass model extended with singlet scalars. In this scenario, lepton number asymmetry is produced through the decay of non-thermal right-handed neutrinos caused from the inflaton decay. Since the amount of non-thermal right-handed neutrinos could be much larger than the thermal ones, the scenario could work without any resonance effect for rather low reheating temperature. Sufficient baryon number asymmetry can be generated for much lighter right-handed neutrinos compared with the Davidson-Ibarra bound.