Scalarization of neutron stars with realistic equations of state

TL;DR

This paper investigates how scalarization affects static and slowly rotating neutron stars across various realistic equations of state, revealing universal relations and correlations with gravitational potential.

Contribution

It provides a comprehensive analysis of scalarization effects on neutron stars with diverse realistic equations of state, including new universal relations and critical coupling parameters.

Findings

Scalarization onset correlates with the star's gravitational potential.

Universal relations for moment-of-inertia and compactness are confirmed.

The magnitude of scalarization depends strongly on the star's central metric component.

Abstract

We consider the effect of scalarization on static and slowly rotating neutron stars for a wide variety of realistic equations of state, including pure nuclear matter, nuclear matter with hyperons, hybrid nuclear and quark matter, and pure quark matter. We analyze the onset of scalarization, presenting a universal relation for the critical coupling parameter versus compactness. We find that the onset and the magnitude of the scalarization are strongly correlated with the value of the gravitational potential (the metric component $g_{tt}$) at the center of the star. We also consider the moment-of-inertia--compactness relations and confirm universality for the nuclear matter, hyperon and hybrid equations of state.