On the impact of non-local gravity on compact stars

TL;DR

This paper investigates how non-local modifications to General Relativity influence the structure of compact stars, providing new constraints on the theory based on observational data from white dwarfs and strange quark stars.

Contribution

It introduces a method to constrain non-local gravity parameters using stellar data, especially from high-density strange quark stars, improving previous bounds significantly.

Findings

Strange quark stars yield the tightest constraints on non-local gravity.

Constraints from strange quark stars are 1000 to 10,000 times stronger than those from white dwarfs.

Current stellar data can effectively limit non-local gravity models.

Abstract

We study the impact of non-local modifications of General Relativity on stellar structure. In particular, assuming an analytic distortion function and specific equations of state, we made use of remnant stars to put qualitative constraints on a parameter not directly restricted by solar system tests. Using current data sets available for white dwarfs and strange quark stars candidates we find that the most stringent bounds come from the objects displaying the highest core densities, namely strange quark stars. Specifically, the constraints obtained from this class of stars are three to four orders of magnitude tighter than those obtained using white dwarfs.