Gravitational baryogenesis in non-minimal kinetic coupling model

TL;DR

This paper explores gravitational baryogenesis within a non-minimal kinetic coupling framework, showing how baryon asymmetry can be generated during reheating regardless of coupling strength, with implications for early universe conditions.

Contribution

It introduces a mechanism for baryon asymmetry generation based on non-minimal derivative coupling, highlighting its independence from coupling constants and applicability at various reheating temperatures.

Findings

Reheating temperature exceeds decoupling temperature.

Baryon asymmetry generation is independent of coupling constant.

The model allows baryogenesis at both low and high reheating temperatures.

Abstract

In this work, we consider the gravitational baryogenesis in the framework of non-minimal derivative coupling model. A mechanism to generate the baryon asymmetry based on the coupling between the derivative of the Ricci scalar curvature and the baryon current in context of non-minimal derivative coupling model is investigated. We show that, in this model, the temperature increases during the reheating periods to the end of reheating period or beginning of radiation dominated era. Therefore the reheating temperature is larger then decoupling temperature. It can be demonstrated that, the evaluation of baryon asymmetry is not depends on coupling constant. In this model we can generate baryon asymmetry at low and high reheating temperature, by considering the high friction constraint.