Radial oscillations and stability of compact stars in Eddington-inspired Born-Infeld gravity

TL;DR

This paper investigates the structure and stability of compact stars within Eddington-inspired Born-Infeld gravity, revealing that standard stability results hold and analyzing how oscillation modes depend on the theory's parameters.

Contribution

It develops a framework for studying radial perturbations and stability of compact stars in Eddington-inspired Born-Infeld gravity, extending understanding of stellar oscillations in this modified gravity theory.

Findings

Standard stellar stability results are valid in this theory.

Fundamental oscillation mode frequency vanishes at maximum mass.

Higher order modes are more sensitive to the coupling parameter .

Abstract

We study the hydrostatic equilibrium structure of compact stars in the Eddington-inspired Born-Infeld gravity recently proposed by Banados and Ferreira [Phys. Rev. Lett. 105, 011101 (2010)]. We also develop a framework to study the radial perturbations and stability of compact stars in this theory. We find that the standard results of stellar stability still hold in this theory. The frequency square of the fundamental oscillation mode vanishes for the maximum-mass stellar configuration. The dependence of the oscillation mode frequencies on the coupling parameter \kappa of the theory is also investigated. We find that the fundamental mode is insensitive to the value of \kappa, while higher order modes depend more strongly on \kappa.