Affleck-Dine leptogenesis in the radiative neutrino mass model

TL;DR

This paper explores Affleck-Dine leptogenesis within a radiative neutrino mass model, offering a novel mechanism to generate the universe's baryon asymmetry that links neutrino masses, dark matter, and baryogenesis.

Contribution

It introduces a new leptogenesis scenario using the flat direction LH_u in a radiative neutrino mass model, relaxing reheating temperature constraints.

Findings

Successfully explains neutrino masses, dark matter, and baryon asymmetry

Proposes a leptogenesis mechanism effective at TeV-scale right-handed neutrino masses

Weakens the reheating temperature constraints compared to traditional models

Abstract

Radiative neutrino mass models have interesting features, which make it possible to relate neutrino masses to the existence of dark matter. However, the explanation of the baryon number asymmetry in the universe seems to be generally difficult as long as we suppose leptogenesis based on the decay of thermal right-handed neutrinos. Since right-handed neutrinos are assumed to have masses of O(1) TeV in these models, they are too small to generate the sufficient lepton number asymmetry. Here we consider Affleck-Dine leptogenesis in a radiative neutrino mass model by using a famous flat direction LH_u as an alternative possibility. The constraint on the reheating temperature could be weaker than the ordinary models. The model explains all the origin of the neutrino masses, the dark matter, and also the baryon number asymmetry in the universe.