Compact Objects in Entangled Relativity

TL;DR

This paper presents the first numerical solutions for compact objects within entangled relativity, an alternative gravity theory, revealing they are consistently heavier than in general relativity under similar conditions.

Contribution

It introduces the first numerical Tolman-Oppenheimer-Volkoff solutions in entangled relativity, demonstrating differences from general relativity without additional free parameters.

Findings

Compact objects are up to 8% heavier in entangled relativity.

The results hold for various central densities and radii.

Entangled relativity predicts distinct mass-radius relations.

Abstract

We describe the first numerical Tolman-Oppenheimer-Volkoff solutions of compact objects in entangled relativity, which is an alternative to the framework of general relativity that does not have any additional free parameter. Assuming a simple polytropic equation of state and the conservation of the rest-mass density, we notably show that, for any given density, compact objects are always heavier (up to $\sim 8\%$) in entangled relativity than in general relativity -- for any given central density within the usual range of neutron stars' central densities, or for a given radius of the resulting compact object.