Dark energy constraint on equation of state parameter in the Weyl type $f(Q,T)$ gravity

Abstract

The equation of state parameter is a significant method for characterizing dark energy models. We investigate the evolution of the equation of state parameter with redshift using a Bayesian analysis of recent observational datasets (the Cosmic Chronometer data (CC) and Pantheon samples). The Chevallier-Polarski-Linder parametrization of the effective equation of state parameter, ${\omega }_{eff}={\omega }_0+{\omega }_a\left(\frac{z}{1+z}\right)$, where ${\omega }_0$ and ${\omega }_a$ are free constants, is confined to the Weyl type $f(Q,T)$ gravity, where $Q$ represents the non-metricity and $T$ is the trace of the energy-momentum tensor. We observe the evolution of the deceleration parameter $q$, the density parameter $\rho$, the pressure $p$, and the effective equation of state parameter $\omega$. The cosmic data limit for $\omega$ does not exclude the possibility of $\omega <-1$. It is seen that the parameter $\omega$ shows a transition from deceleration to acceleration, as well as a shift from $\omega >-1$ to $\omega <-1$.

arXiv commentAnnals of Physics accepted version

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