Hot and dense gas of quark quasi-particles

TL;DR

This paper explores the behavior of hot and dense quark gases modeled as quasi-particles, revealing phase transitions and the possibility of mixed phases relevant to chiral symmetry restoration.

Contribution

It introduces a quasi-particle model based on the Nambu-Jona-Lasinio framework to study phase transitions in quark matter, including vacuum-baryonic mixed phases.

Findings

Identification of a nuclear liquid-gas type phase transition.

Proposal of a mixed vacuum and baryonic matter phase at zero temperature.

Implications for partial chiral symmetry restoration.

Abstract

Some features of hot and dense gas of quarks which are considered as the quasi-particles of the model Hamiltonian with four-fermion interaction are studied. Being adapted to the Nambu-Jona-Lasinio model this approach allows us to accommodate a phase transition similar to the nuclear liquid-gas one at the proper scale. It allows us to argue an existence of the mixed phase of vacuum and baryonic matter (even at zero temperature) as a plausible scenario of chiral symmetry (partial) restoration.