Gravitational Baryogenesis in Running Vacuum models

TL;DR

This paper investigates how running vacuum models can generate baryon asymmetry through gravitational baryogenesis, showing they produce a non-zero baryon-to-entropy ratio compatible with observations, unlike standard Einstein-Hilbert models.

Contribution

It demonstrates that running vacuum models inherently produce a non-zero baryon-to-entropy ratio, offering a novel mechanism for baryogenesis distinct from traditional models.

Findings

Running vacuum models yield a non-zero baryon-to-entropy ratio.

The predicted ratio aligns with observational data.

Gravitational baryogenesis can constrain running vacuum models.

Abstract

We study the gravitational baryogenesis mechanism for generating baryon asymmetry in the context of running vacuum models. Regardless if these models can produce a viable cosmological evolution, we demonstrate that they produce a non-zero baryon-to-entropy ratio even if the universe is filled with conformal matter. This is a sound difference between the running vacuum gravitational baryogenesis and the Einstein-Hilbert one, since in the latter case, the predicted baryon-to-entropy ratio is zero. We consider two well known and most used running vacuum models and show that the resulting baryon-to-entropy ratio is compatible with the observational data. Moreover, we also show that the mechanism of gravitational baryogenesis may constrain the running vacuum models.