Non-thermal Leptogenesis after Majoron Hilltop Inflation

TL;DR

This paper investigates non-thermal leptogenesis in Majoron hilltop inflation models, highlighting how resonant sneutrino production during preheating can significantly enhance baryon asymmetry, thus impacting model parameter constraints.

Contribution

It introduces the inclusion of resonant sneutrino production effects in leptogenesis calculations within Majoron inflation models, revealing their substantial impact on baryon asymmetry.

Findings

Resonant sneutrino production can boost baryon asymmetry by over an order of magnitude.

The results alter the preferred parameter space of Majoron hilltop inflation models.

Numerical solutions of Boltzmann equations confirm the significance of preheating effects.

Abstract

We analyse non-thermal leptogenesis after models of Majoron hilltop inflation, where the scalar field that provides masses for the right-handed neutrinos and sneutrinos via its vacuum expectation value acts as the inflaton. We discuss different realisations of Majoron inflation models with different hilltop shapes and couplings to the right-handed (s)neutrinos. To study the non-thermally produced baryon asymmetry in these models, we numerically solve the relevant Boltzmann equations. In contrast to previous studies, we include the effects from resonant sneutrino particle production during preheating. We find that these effects can result in an enhancement of the produced baryon asymmetry by more than an order of magnitude. This can significantly change the favoured parameter regions of these models.