Baryogenesis via leptogenesis in multi-field inflation

TL;DR

This paper explores how baryogenesis can occur through non-thermal leptogenesis during multi-field reheating after modular $j$-inflation, identifying key conditions and parameter bounds for successful matter-antimatter asymmetry generation.

Contribution

It introduces a framework for baryogenesis via leptogenesis in multi-field inflation, incorporating hierarchical right-handed neutrinos and deriving bounds on inflaton parameters.

Findings

Allowed parameter space for baryogenesis identified

Upper bound on inflaton mass established

Lower bound on inflaton decay branching ratio determined

Abstract

In multi-field reheating after modular $j$-inflation we investigate the conditions under which baryogenesis via non-thermal leptogenesis can be successfully realized. We introduce three heavy right-handed neutrinos to the non-supersymmetric Standard Model of particle physics, assuming hierarchical neutrino masses. Considering a typical mass for the first right-handed neutrino of the order of $10^{11}~GeV$, suggested from the seesaw mechanism and also from concrete $SO(10)$ grand unification models, we obtain the allowed parameter space for viable baryogenesis. An upper bound for the inflaton mass as well as a lower bound for its branching ratio to the pair of lightest right-handed neutrinos are found and reported.