Neutron star properties and the symmetry energy

TL;DR

This paper investigates how the symmetry energy influences neutron star characteristics, revealing a linear relationship between star radius and symmetry energy slope for stars over one solar mass, and analyzing hyperon content and Urca process onset.

Contribution

It provides new insights into the dependence of neutron star properties on the symmetry energy and explores hyperon content and Urca process thresholds.

Findings

Star radius varies linearly with symmetry energy slope L for stars above 1 M_sun.

Hyperon content and Urca process onset density depend on symmetry energy and meson coupling.

The study links nuclear physics parameters to observable neutron star features.

Abstract

The effect of the symmetry energy on the properties of compact stars is discussed. It is shown that, for stars with masses above 1 $M_\odot$, the radius of the star varies linearly with the symmetry energy slope $L$. The dependence of the hyperon content and onset density of the direct Urca process on the symmetry energy and meson coupling parametrization are also analyzed.