Dark Energy Nature in Logarithmic $f(R,T)$ Cosmology

Abstract

The present research paper is an investigation of dark energy nature of logarithmic $f(R,T)$-gravity cosmology in a flat FLRW space-time universe. We have derived modified Einstein's field equations for the function $f(R,T)=R-16\pi G\alpha \ln (T)$ where $R$ is the Ricci scalar curvature, $T$ is the trace of the stress energy momentum tensor and $\alpha$ is a model parameter. We have solved field equations in the form of two fluid scenario as perfect-fluid and dark-fluid, where dark fluid term is derived in the form of perfect fluid source. We have made an observational constraints on the cosmological parameters ${\Omega }_{(m)},{\omega }^{(de)}$ and $H_0$ using ${\chi }^2$ test with observational datasets like Pantheon sample of SNe Ia and $H(z)$. With these constraints we have discussed our model with deceleration parameter $q$, energy parameters ${\Omega }_{(m)},{\Omega }_{(de)}$, EoS parameter ${\omega }^{(de)}$ etc. Also, we have done Om diagnostic analysis. The derived $f(R,T)$ model shows a quintessence dark energy model ${\omega }^{(de)}>-1$ and late-time universe approaches to $\Lambda$CDM model.

16 pages, 8 figures

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• Dynamical reconstruction of the $\Lambda$CDM model in scalar-tensor $f(R,T)$ gravity
• Are $f(R,\mathrm{Matter})$ theories really relevant to cosmology?
• Constrained transit cosmological models in $f(R,L_m,T)$-gravity
• Cosmological implications and causality in $f(R,L_m,T)$ gravity theory with observational constraints