Novel Neutron Star Structures with Nucleon Mass Radius

TL;DR

This paper investigates how the nucleon mass radius influences neutron star structure, proposing a new mass-radius relation that aligns with GW170817 observations by incorporating recent nucleon size measurements.

Contribution

It introduces a novel neutron star model considering nucleon mass radius effects within the excluded volume framework, aligning theoretical predictions with recent observational data.

Findings

Nucleon mass radius significantly affects neutron star equations of state.

The new model's mass-radius relation matches GW170817 observations.

Inclusion of nucleon size improves neutron star structure predictions.

Abstract

In order to reveal the difference between the latest neutron star observation experiment GW170817 and the existing theory, we mainly consider the effect of the nucleon radius on the neutron star from the existing theory. We believe that the effect of nucleon radius in neutron star is not negligible, and the mass radius of nucleon should be used instead of the charge radius. The nucleon mass radius is set as $r_m = 0.55\pm0.09$ fm from the new measurements. It is considered as an input to the "Excluded Volume Effects" model in the equation of state of nuclear matter. We propose a novel neutron star mass-radius relation by using proton mass radius is consistent with the observation GW170817.