Quark-Hadron Phase-Transition in an Extended NJL Model with Scalar-Vector Interaction

TL;DR

This paper explores the quark-hadron phase transition using an extended NJL model, revealing a quarkyonic-like phase where chiral symmetry is restored but nucleonic excitations persist, influenced by scalar-vector interactions.

Contribution

It introduces an extended NJL model with scalar-vector interaction to analyze the phase diagram and the effects on chiral transition and quarkyonic-like phase.

Findings

Identification of a quarkyonic-like phase before deconfinement.

Effects of scalar-vector coupling on the chiral phase transition.

Extended phase diagram in temperature and chemical potential.

Abstract

The quark-hadron phase transition at finite temperature and baryon chemical potential is investigated in an extended NJL model with scalar-vector eight-point interaction by comparing the pressure of symmetric nuclear matter with that of the quark matter. As a result, the extended NJL phase diagram is obtained in the temperature-baryon chemical potential plane and the effects of the scalar-vector coupling constant G_{sv}^q on the chiral phase transition are summarized. It is shown that a quarkyonic-like phase in which the chiral symmetry is restored but the elementary excitation modes are nucleonic appears just before deconfinement in this model.