Energy conditions in $f(Q,T)$ gravity

Abstract

The recently proposed $f(Q,T)$ gravity (Xu et al. Eur. Phys. J. C \textbf{79} (2019) 708) is an extension of the symmetric teleparallel gravity. The gravitational action $L$ is given by an arbitrary function $f$ of the non-metricity $Q$ and the trace of the matter-energy momentum tensor $T$. In this paper, we examined the essence of some well prompted forms of $f(Q,T)$ gravity models i.e. $f(Q,T)=mQ+bT$ and $f(Q,T)=m{Q}^{n+1}+bT$ where $m$, $b$, and $n$ are model parameters. We have used the proposed deceleration parameter, which predicts both decelerated and accelerated phases of the Universe, with the transition redshift by recent observations and obtains energy density ($\rho$) and pressure ($p$) to study the various energy conditions for cosmological models. The equation of state parameter ($\omega \simeq -1$) in the present model also supports the accelerating behavior of the Universe. In both, the models, the null, weak, and dominant energy conditions are obeyed with violating strong energy conditions as per the present accelerated expansion.

Published version in Physica Scripta

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• Generalized Ghost Pilgrim Dark Energy Fractal Cosmology with Observational Constraint
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• Reconstruction of Tsallis Holographic Dark Energy via Modified Non-Metric Gravity: An $f(Q,C)$ Approach
• Cosmological Constraints on f(T,B) Gravity from Observations of Early and Late Universe
• Inflation and primordial fluctuations in $f(Q,T)$ gravity
• Dynamics of Linear Scalar Perturbation in f(Q)+f(T) class of f(Q,T) gravity