On Baryogenesis from a Complex Inflaton

TL;DR

This paper revisits inflationary baryogenesis with a complex inflaton, deriving a new particle asymmetry result that is smaller than previous estimates but still allows for baryogenesis in some parameter spaces.

Contribution

It provides a revised calculation of particle asymmetry in inflationary baryogenesis with a complex inflaton, correcting earlier results and exploring parameter regions for successful baryogenesis.

Findings

Asymmetries are significantly smaller than previously estimated.

Baryogenesis remains possible in certain parameter regions.

New derivation alters the understanding of inflaton-induced asymmetry.

Abstract

We derive the particle asymmetry due to inflationary baryogenesis involving a complex inflaton, obtaining a different result to that in the literature. While asymmetries are found to be significantly smaller than previously calculated, in certain parameter regions baryogenesis can still be achieved.