Separated matter and antimatter domains with vanishing domain walls

TL;DR

This paper proposes a cosmological model where matter and antimatter domains are generated without stable domain walls, due to a transient C and CP violation in the early universe caused by inflaton interactions.

Contribution

It introduces a novel mechanism of short-lived C and CP violation through inflaton interactions, avoiding the domain wall problem in matter-antimatter domain models.

Findings

Matter and antimatter domains can form without stable domain walls.

C and CP violation is transient, existing only in the early universe.

The model aligns with cosmological observations by eliminating domain wall issues.

Abstract

We present a model of spontaneous (or dynamical) C and CP violation where it is possible to generate domains of matter and antimatter separated by cosmologically large distances. Such C(CP) violation existed only in the early universe and later it disappeared with the only trace of generated baryonic and/or antibaryonic domains. So the problem of domain walls in this model does not exist. These features are achieved through a postulated form of interaction between inflaton and a new scalar field, realizing short time C(CP) violation.