Isotropic compact stars in 4D Einstein-Gauss-Bonnet gravity

TL;DR

This paper explores how a modified 4D Einstein-Gauss-Bonnet gravity theory can produce realistic models of compact stars, showing that higher curvature effects can be compatible with observed stellar phenomena.

Contribution

It introduces a novel approach to stellar modeling within 4D Einstein-Gauss-Bonnet gravity, deriving new exact solutions that align with physical requirements of compact stars.

Findings

New exact solutions for compact stars in 4D Einstein-Gauss-Bonnet gravity

Demonstration that modified theory can produce physically viable stellar models

Analysis of a specific model consistent with observational constraints

Abstract

Recently it has been proposed that the Gauss-Bonnet coupling parameter of Lovelock gravity may suitably be rescaled in order to admit physically viable models of celestial phenomena such that higher curvature effects are active in standard four dimensions as opposed to the usual higher dimensions. We investigate the consequences of this modification in the context of stellar modelling. The evolution of perfect fluid distributions is governed by the pressure isotropy condition and through stipulation of one of the metric potentials complete models emerge from solutions of the master differential equation. New classes of exact solution with this approach have been reported. One particular model is analysed in detail and shown to comport with elementary physical requirements demanded of realistic compact stars suggesting that the modified theory is not inconsistent with observations.