Leptogenesis in Inflaton Decay

TL;DR

This paper explores a leptogenesis mechanism where heavy Majorana neutrinos produced from inflaton decays generate the matter-antimatter asymmetry, compatible with various inflation models and low reheating temperatures.

Contribution

It demonstrates that leptogenesis via inflaton decay is consistent with supersymmetric inflation models and low reheating temperatures, addressing the gravitino problem.

Findings

Leptogenesis can occur with reheating temperatures as low as 10^8 GeV.

The scenario aligns with topological and hybrid inflation models.

It integrates the Froggatt-Nielsen mechanism for mass hierarchy generation.

Abstract

We study a leptogenesis via decays of heavy Majorana neutrinos produced non-thermally in inflaton decays. We find that this scenario is fully consistent with existing supersymmetric inflation models such as for topological or for hybrid inflation and the Froggatt-Nielsen mechanism generating hierarchies in quark and lepton mass matrices. The reheating temperature $T_R$ of inflation may be taken as low as $T_R \simeq 10^8$ GeV to avoid the cosmological gravitino problem.