Hadron-quark mixed phase in hyperon stars

TL;DR

This paper investigates the hadron-quark phase transition in hyperon-rich neutron stars using advanced models, highlighting how different transition constructions affect star structure more than maximum mass.

Contribution

It provides a detailed comparison of Maxwell and Gibbs phase transition models including surface tension and screening effects in hyperon-rich matter.

Findings

Small impact on maximum neutron star mass.

Significant influence on star radius and internal structure.

Abstract

We analyze the different possibilities for the hadron-quark phase transition occurring in beta-stable matter including hyperons in neutron stars. We use a Brueckner-Hartree-Fock approach including hyperons for the hadronic equation of state and a generalized MIT bag model for the quark part. We then point out in detail the differences between Maxwell and Gibbs phase transition constructions including the effects of surface tension and electromagnetic screening. We find only a small influence on the maximum neutron star mass, whereas the radius of the star and in particular its internal structure are more affected.