Spontaneous Baryogenesis from Asymmetric Inflaton

TL;DR

This paper introduces a new spontaneous baryogenesis mechanism involving asymmetric inflaton interactions, demonstrating its natural implementation within chaotic inflation models in supergravity, and explaining how it generates baryon asymmetry.

Contribution

It proposes a novel spontaneous baryogenesis scenario based on current-current interactions with asymmetric inflaton, applicable to chaotic inflation in supergravity.

Findings

The scenario can generate sufficient baryon asymmetry.

It is naturally realized in chaotic inflation models.

The mechanism involves CP-odd inflaton components inducing chemical potential.

Abstract

We propose a variant scenario of spontaneous baryogenesis from asymmetric inflaton based on current-current interactions between the inflaton and matter fields with a non-zero B-L charge. When the inflaton starts to oscillate around the minimum after inflation, it may lead to excitation of a CP-odd component, which induces an effective chemical potential for the B-L number through the current-current interactions. We study concrete inflation models and show that the spontaneous baryogenesis scenario can be naturally implemented in the chaotic inflation in supergravity.