Baryon Asymmetries in the Natural Inflation Model

TL;DR

This paper adapts a baryon asymmetry generation mechanism to natural inflation models, demonstrating it can produce the observed baryon-to-photon ratio similarly to chaotic inflation models.

Contribution

It extends the Affleck-Dine baryogenesis mechanism to natural inflation, comparing its effectiveness with chaotic inflation models.

Findings

Baryon-to-photon ratio can be achieved in natural inflation models.

The mechanism works equally well in natural and chaotic inflation scenarios.

Net baryon number generated matches observational requirements.

Abstract

A variation of Affleck-Dine mechanism was proposed to generate the observed baryon asymmetry in [1], in which the inflaton was assumed to be a complex scalar field with a weakly broken $U(1)$ symmetry, and the baryon asymmetry generation was easily unified with the stage of inflation and reheating. We adapt this mechanism to natural inflation scenarios and compare the results with those in chaotic inflation models. We compute the net particle number obtained at the end of inflation and transform it into net baryon number after reheatings. We observed that in natural inflation models, the desired baryon-to-photon ratio can be achieved equally well as in chaotic models.