Gravitational Baryogenesis in Anisotropic Universe

TL;DR

This paper investigates how anisotropy in an expanding universe influences gravitational baryogenesis, focusing on Ricci scalar-curvature interactions in a Bianchi type I model with time-dependent equation of state.

Contribution

It extends gravitational baryogenesis models to anisotropic universes, analyzing the impact of anisotropy and time-dependent parameters on baryon asymmetry.

Findings

Anisotropy affects the magnitude of baryon asymmetry.

Time-dependent equation of state influences baryogenesis outcomes.

The model provides insights into early universe conditions.

Abstract

The interaction between Ricci scalar curvature and the baryon number current, dynamically breaks CPT in an expanding universe and leads to baryon asymmetry. Using this kind of interaction and study the gravitational baryogenesis in the Bianchi type I universe. We find out the effect of anisotropy of the universe on the baryon asymmetry for the case which the equation of state parameter, $\omega$, is dependent to time.