Baryon Asymmetry Constraints on Extended Symmetric Teleparallel Gravity

Abstract

We have explored the observed matter-antimatter asymmetry in the Universe to constrain the model parameters in Extended Symmetric Teleparallel Gravity (STG) or \(f(Q,T)\) gravity, where \(Q\) is the nonmetricity and \(T\) is the trace of the energy momentum tensor. We have considered two functional forms of \(f(Q,T)\) to find the baryon asymmetry to entropy ratio calculated at a decoupling temperature. Two different data sets, namely, the Hubble data set and the \(\text{Hubble}+\text{BAO}+\text{Pantheon}\) data set, are used to constrain the scale factor, and the constrained model is used to obtain the baryon asymmetry to entropy ratio. It is observed that the model constrained from the Hubble data set favors a narrow range of the \(f(Q,T)\) gravity parameters to reproduce the observed baryon asymmetry.