Properties of white dwarf with anisotropic pressure in Rainbow gravity

TL;DR

This paper explores how anisotropic pressure influences the properties of white dwarf stars within rainbow gravity, revealing effects on mass, radius, and stability without violating causality.

Contribution

It introduces the first detailed analysis of anisotropic white dwarfs in rainbow gravity, highlighting the impact of anisotropic factors on stellar stability and structure.

Findings

Anisotropic factor affects stellar mass and radius.

Causality remains intact despite anisotropy.

Positive anisotropic factor near Chandrasekhar limit destabilizes stars.

Abstract

We investigate the properties of anisotropic white dwarf stars within the rainbow gravity adopting for matter content the Chandrasekhar model based on an ideal Fermi gas at zero temperature. We study in detail the effects of the anisotropic factor on stellar mass and radius, the speed of sound, and the relativistic adiabatic index in both radial and tangential directions. We find that causality is never violated, whereas the stability criterion based on the relativistic adiabatic index is not met when the objects are characterized by a positive anisotropic factor close to the Chandrasekhar limit. We present this significant observation here for the first time, to the best of our knowledge.