Impact of Ricci Inverse Gravity on Hybrid Star Model

TL;DR

This paper investigates a hybrid star model composed of quark and baryonic matter within a modified gravity framework, demonstrating its physical viability through various stability and observational criteria.

Contribution

It introduces a novel hybrid star model in $f( ext{R}, ext{A})$ gravity using specific equations of state and the Krori-Barua metric approach, validating its physical plausibility.

Findings

Model satisfies energy conditions and stability criteria.

Predicts realistic mass, radius, and redshift for LMC X-4.

Confirms the feasibility of hybrid quark stars in modified gravity.

Abstract

The objective of our current study is to explore novel aspects of a stationary anisotropic relativistic hybrid compact star that consists of quark matter (QM) in its core and ordinary baryonic matter (OBM) in its crust. This study has been done by adopting separate equations of states (EoSs) for quark matter and baryonic matter. The MIT bag model equation of state $p_{q}=\frac{1}{3}(\rho_{q}-4B)$ has been used to demonstrate a correlation between the density and pressure of weird quark matter in the interior of the star. In addition, we present a simple linear equation of state $p_{r}=\beta_{1}\rho-\beta$ that links radial pressure and matter density for OBM. The stellar model was formulated within the context of $f(\mathcal{R},\mathcal{A})$ gravity, utilizing a linear correlation between Ricci tensor $\mathcal{R}$ and anticurvature scaler $\mathcal{A}$.To solve the field equations of this novel alternative gravity, we employ the Krori and Barua approach to the metric potentials. The validity of our suggested model is assessed using the graphical approach, while ensuring that the conditions are physically feasible. Our focus is specifically on the tiny celestial object known as LMC X-4 [$\text{M} = (1.04^{+0.09}_{-0.09})M_{\odot};\text{R}=8.301^{+0.2}_{-0.2}\text{km}$], which we consider a viable candidate for a strange quark star. We want to clarify the model's physical validity by examining a variety of physical assessments, including dynamical equilibrium, energy conditions, compactness factor, mass function, and surface redshift. The resulting outcome confirms the authenticity of the hybrid star model under analysis.