First Order Quark-Hadron Phase Transition in the NJL-Type Nuclear and Quark Model

TL;DR

This paper investigates the first order quark-hadron phase transition at finite baryon chemical potential using an extended NJL model that includes scalar-vector interactions, revealing the deconfinement occurs after chiral symmetry restoration.

Contribution

It introduces an extended NJL model with scalar-vector eight-point interaction to study the quark-hadron phase transition at finite density, highlighting the sequence of deconfinement and chiral symmetry restoration.

Findings

First order quark-hadron phase transition identified.

Deconfinement occurs after chiral symmetry restoration.

Model includes scalar-vector eight-point interaction.

Abstract

The quark-hadron phase transition at finite baryon chemical potential is investigated in the extended Nambu-Jona-Lasinio model in which the scalar-vector eight-point interaction is included holding the chiral symmetry. By comparing a pressure of the symmetric nuclear matter with that of the quark matter, the realized phase at given baryon density is determined. As a result, the first order quark-hadron phase transition is derived where the deconfinement transition occurs after the chiral symmetry restoration in this model.