Affleck-Dine baryogenesis just after inflation

TL;DR

This paper introduces a new Affleck-Dine baryogenesis scenario occurring immediately after inflation, which is less dependent on low-energy supersymmetry and compatible with various inflation models, including hybrid and chaotic types.

Contribution

It presents a novel post-inflationary baryogenesis mechanism that broadens the viable models and naturally avoids gravitino overproduction issues.

Findings

Baryon asymmetry generated is independent of low-energy SUSY models.

Reheating temperature requirements are higher than in conventional scenarios.

Hybrid inflation models naturally avoid gravitino overproduction.

Abstract

We propose a new scenario of Affleck-Dine baryogenesis where a flat direction in the MSSM generates B-L asymmetry just after the end of inflation. The resulting amount of baryon asymmetry is independent of low-energy supersymmetric models but is dependent on inflation models. We consider the hybrid and chaotic inflation models and find that reheating temperature is required to be higher than that in the conventional scenario of Affleck-Dine baryogenesis. In particular, non-thermal gravitino-overproduction problem is naturally avoided in the hybrid inflation model. Our results imply that Affleck-Dine baryogenesis can be realized in a broader range of supersymmetry and inflation models than expected in the literature.