Super-soft symmetry energy encountering non-Newtonian gravity in neutron stars

TL;DR

This paper explores how non-Newtonian gravity could allow super-soft nuclear symmetry energies in neutron stars without conflicting with observed properties, suggesting potential deviations from inverse-square law at high densities.

Contribution

It demonstrates that non-Newtonian gravity models can reconcile super-soft symmetry energies with neutron star observations, expanding understanding of gravity and nuclear matter at extreme densities.

Findings

Super-soft symmetry energies are compatible with neutron star data under non-Newtonian gravity.

Estimated violation of inverse-square law in neutron stars is consistent with current constraints.

EOS consistent with terrestrial data supports non-Newtonian gravity effects in dense matter.

Abstract

Considering the non-Newtonian gravity proposed in the grand unification theories, we show that the stability and observed global properties of neutron stars can not rule out the super-soft nuclear symmetry energies at supra-saturation densities. The degree of possible violation of the Inverse-Square-Law of gravity in neutron stars is estimated using an Equation of State (EOS) of neutron-rich nuclear matter consistent with the available terrestrial laboratory data.