The importance of the mixed phase in hybrid stars built with the Nambu-Jona-Lasinio model

TL;DR

This paper explores how the presence of a mixed phase affects the structure of hybrid stars, using different phase transition models and specific equations of state for hadronic and quark matter.

Contribution

It compares the effects of Gibbs and Maxwell constructions on hybrid star properties using NLW and NJL models, highlighting model dependence.

Findings

Masses and radii are similar across models despite different constructions.

The mixed phase influences star structure but does not drastically change observable properties.

Model choice impacts the detailed internal composition of hybrid stars.

Abstract

We investigate the structure of hybrid stars based on two different constructions: one is based on the Gibbs condition for phase coexistence and considers the existence of a mixed phase (MP), and the other is based on the Maxwell construction and no mixed phase is obtained. The hadron phase is described by the non-linear Walecka model (NLW) and the quark phase by the Nambu-Jona-Lasinio model (NJL). We conclude that the masses and radii obtained are model dependent but not significantly different for both constructions.