$f(R,T)$ models applied to Baryogenesis

TL;DR

This paper investigates gravitational baryogenesis within $f(R,T)$ gravity models, analyzing two specific forms and constraining their parameters to match observed baryon-to-entropy ratios during radiation domination.

Contribution

It introduces and tests two novel $f(R,T)$ gravity models for baryogenesis, providing parameter constraints consistent with observational data.

Findings

Models can produce non-zero baryon-to-entropy ratio during radiation era.

Parameter ranges compatible with observational baryon asymmetry.

Demonstrates viability of $f(R,T)$ gravity in explaining baryogenesis.

Abstract

This paper is devoted to the reproduction of the gravitational baryogenesis epoch in the context of $f(R, T)$ theory of gravity, where $R$ and $T$ are respectively the curvature scalar and the trace of the energy-momentum tensor, respectively. It is assumed a minimal coupling between matter and gravity. In particular we consider the following two models, $f(R,T) = R +\alpha T + \beta T^2$ and $f(R,T) = R+ \mu R^2 + \lambda T$, with the assumption that the universe is filled by dark energy and perfect fluid where the baryon to entropy ratio during a radiation domination era is non-zero. We constrain the models with the cosmological gravitational baryogenesis scenario, highlighting the appropriate values of model's parameters compatible with the observation data of the baryon-entropy ratio.