Inflatonic baryogenesis with large tensor mode

TL;DR

This paper proposes a baryogenesis mechanism involving a complex inflaton with CP asymmetry, linking baryon asymmetry to tensor modes in the CMB, and suggests future observations could test this scenario.

Contribution

It introduces a novel inflaton-based baryogenesis model that connects baryon asymmetry with tensor-to-scalar ratio, providing testable predictions for future CMB observations.

Findings

The model links baryon asymmetry to tensor modes in the CMB.

Future CMB observations can test the proposed baryogenesis scenario.

The CP asymmetric term influences inflaton decay and tensor-to-scalar ratio.

Abstract

We consider the complex inflaton field with a CP asymmetric term for its potential. This CP asymmetric term produces the global charge of the inflaton after inflation. With the assignment of the baryon number to the inflaton, the baryon asymmetry of the universe is produced by inflaton's decay. In addition to this, the $U(1)$ breaking term modulates the curvature of the inflaton radial direction depending on its phase, which affects the tensor to scalar ratio. In this paper, we have studied the relation between the baryon asymmetry and the tensor to scalar ratio, then verified that the future CMB observation could test this baryogenesis scenario with large tensor mode.