In this paper, we investigate the cosmic expansion scenarios within the framework of f(Q,T) gravity by using the affine equation of state (EoS) parameter. Specifically, we consider the linear form f(Q,T)=Q+βT, where β is a free model parameter. We use Bayesian statistical methods, specifically the χ2 minimization technique to constrain the model parameters using Cosmic Chronometer (CC), Pantheon+SH0ES and DESI BAO data. We further analyze the characteristics of the derived cosmological model. A comprehensive study of energy density, pressure, equation of state parameter and cosmographic parameters are carried out to understand the evolution of the Universe in this model. The determination of present age of the universe for this model is within 1σ with Planck results.
@article{arxiv.2604.21151,
title = {The $f(Q, T)$ gravity and affine EoS: observational aspects},
author = {Romanshu Garg and G. P. Singh},
journal= {arXiv preprint arXiv:2604.21151},
year = {2026}
}