Physical validity of anisotropic models derived from isotropic fluid dynamics in $f(R,T)$ theory: An implication of gravitational decoupling

TL;DR

This paper develops anisotropic stellar models within $f(R,T)$ gravity using gravitational decoupling, demonstrating their physical viability for specific parameters based on the star LMC X-4.

Contribution

It introduces a novel method to generate anisotropic solutions in $f(R,T)$ gravity via gravitational decoupling and assesses their physical acceptability.

Findings

Models are physically valid for certain parameter ranges.

Anisotropic models match observational data of LMC X-4.

The approach extends the applicability of $f(R,T)$ gravity in stellar modeling.

Abstract

In this paper, we derive multiple anisotropic analogs from the established isotropic model by means of the gravitational decoupling approach in a fluid-geometry interaction based theory. To accomplish this, we initially consider a static spherical perfect-fluid configuration and then introduce a new matter source to induce anisotropic behavior in the system. The resulting field equations encapsulate the entire matter distribution and thus become much complicated. We then split these equations into two sets through implementing a particular transformation, each set delineating characteristics attributed to their original fluid sources. We adopt the Heintzmann's ansatz and some constraints on extra gravitating source to deal with the first and second systems of equations, respectively. Furthermore, the two fundamental forms of the matching criteria are used to make the constant in the considered solution known. By utilizing the preliminary information of a star candidate LMC X-4, we assess the physical validity of the developed models. Our analysis indicates that both our models exhibit characteristics which are well-agreed with the acceptability criteria for certain parametric values.