Estimation of Cosmological Parameters, Stability Analysis and Energy Conditions in Viable Modified Gravity

TL;DR

This paper explores a modified gravity model to estimate cosmological parameters, analyze energy conditions, and fit observational data, providing insights into the universe's expansion and age.

Contribution

It introduces a specific $f(R,T)$ gravity model, solves the field equations numerically, and fits observational data to estimate cosmological parameters.

Findings

Estimated current Hubble and deceleration parameters.

Determined the universe's age using redshift data.

Analyzed energy conditions in the modified gravity context.

Abstract

In the present paper, we have investigated the Friedmann Robertson Walker (FRW) model in viable $f(R,T)$ gravity with $f(R,T)$ function proposed as $f(R,T)=R +\xi T^{1/2}$, where $\xi$ is an arbitrary constant, $R$ is the scalar curvature and $T$ is the trace of stress energy tensor. Defining the scale factor, the field equations are solved numerically and the energy conditions are analyzed. Further, determining Hubble parameter and deceleration parameter, their present values are estimated. Furthermore, 57 redshift data (42 redshift data from Supernova Cosmology project and 15 redshift data from Cal\'{a}n/ Tolono Supernova survey) are used to estimate the age of the universe and to find the best fit curves for luminosity distance and apparent magnitude.