EDSFD parametrization in $f(R,T)$ gravity with linear curvature terms

Abstract

This paper investigates the flat Friedmann-Lema$\hat{ı}$tre-Robertson-Walker (FLRW) cosmological model using a suitable parameterization represented as a differential equation concerning the energy density of the scalar field, ${\rho }_{\varphi }$, in the context of $f(R,T)$ gravity theory. This parameterization is known as the Energy Density Scalar Field Differential Equation (EDSFD) parametrization. It results in a solution of the Hubble parameter containing four model parameters, namely, ${\Omega }_{m0},{\Omega }_{\varphi 0},H_0,$ and $\alpha$. To constrain the model parameters, $77$ data points from the Hubble dataset, $1048$ points from the Pantheon dataset, and $6$ data points from BAO are used. Using the constrained values, we analyze and compare our model with the standard $\Lambda$CDM model. The evolution of the physical parameters, which includes the deceleration parameter, density parameter, Equation of State (EoS) for Dark Energy, and $Om(z)$ diagnostic, are discussed.

arXiv comment16 pages, 18 figures