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

TL;DR

This paper presents a novel non-thermal mechanism where inflaton decay generates lepton asymmetry in a modified radiative neutrino mass model, linking neutrino masses, dark matter, and baryon asymmetry.

Contribution

It introduces a new scenario where inflaton decay directly produces lepton asymmetry, connecting neutrino mass, dark matter, and baryogenesis in a unified framework.

Findings

Lepton asymmetry is generated in the dark matter sector via inflaton decay.

Lepton asymmetry is transferred to the lepton sector through dark matter annihilation.

The model links neutrino masses, dark matter, and baryon asymmetry through inflaton dynamics.

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.