Excluded Volume Effects on Cold Neutron Star Phenomenology

TL;DR

This paper investigates how short-range repulsion modeled via excluded volume effects influences neutron star properties, demonstrating that massive neutron stars with hyperons can still match observational constraints.

Contribution

It introduces an excluded volume framework at the quark level to incorporate short-range repulsion in the hadronic equation of state for neutron stars.

Findings

Neutron stars up to 2.2 solar masses are sustainable with hyperons.

Predicted radii and tidal deformabilities align with current observational constraints.

Excluded volume effects allow for realistic modeling of dense matter in neutron stars.

Abstract

Observable properties of neutron stars are studied within a hadronic equation of state derived from the quark level. The effect of short-range repulsion is incorporated within the excluded volume framework. It is found that one can sustain neutron stars with masses as large as 2.2$M_\odot$ even including hyperons in $\beta$ equilibrium, while producing radii and tidal deformabilities consistent with current constraints.