Phase transition towards strange matter

TL;DR

This paper investigates the phase diagram of neutron and hyperon matter, revealing complex phase transitions including those towards strange matter, with implications for neutron star core composition.

Contribution

It demonstrates that phase transitions involving strangeness are generic and can occur under broad conditions, independent of specific interaction models.

Findings

Presence of first and second order phase transitions in the system

Conditions under which strange matter phase transition occurs

Implications for neutron star core composition

Abstract

The phase diagram of a system constituted of neutrons and $\Lambda$-hyperons in thermal equilibrium is evaluated in the mean-field approximation. It is shown that this simple system exhibits a complex phase diagram with first and second order phase transitions. Due to the generic presence of attractive and repulsive couplings, the existence of phase transitions involving strangeness appears independent of the specific interaction model. In addition we will show under which conditions a phase transition towards strange matter at high density exists, which is expected to persist even within a complete treatment including all the different strange and non- strange baryon states. The impact of this transition on the composition of matter in the inner core of neutron stars is discussed.