Massive white dwarfs in Rastall-Rainbow gravity

TL;DR

This paper explores how Rastall-Rainbow gravity modifies white dwarf properties, revealing significant deviations from general relativity, including potential super-Chandrasekhar masses and altered stability characteristics.

Contribution

It introduces a novel analysis of white dwarf structure within Rastall-Rainbow gravity, extending the understanding of stellar equilibrium in modified gravity theories.

Findings

Maximum white dwarf mass exceeds Chandrasekhar limit

Altered mass-radius relations compared to GR

Changes in gravitational redshift and stability properties

Abstract

We investigate the hydrostatic equilibrium of white dwarfs within the framework of Rastall-Rainbow gravity, aiming to explore the effects of this modified gravitational theory on their properties. By employing the Chandrasekhar equation of state in conjunction with the modified Tolman-Oppenheimer-Volkoff equation, we derive the mass-radius relations for white dwarfs. Our results show that the maximum mass of white dwarfs deviates significantly from the predictions of general relativity, potentially exceeding the Chandrasekhar limit. Furthermore, we discuss other properties of white dwarfs, such as the gravitational redshift, compactness and dynamical stability, shedding light on their behavior within the context of this modified gravitational framework.