QCD phase diagram at finite baryon and isospin chemical potentials in Polyakov loop extended quark meson model with vector interaction

TL;DR

This paper explores the QCD phase diagram at finite baryon and isospin chemical potentials using an extended quark-meson model, revealing how isospin asymmetry affects the critical point and phase transition nature, with implications for neutron star cores.

Contribution

It introduces a study of the QCD phase diagram with vector interactions in an extended quark-meson model considering isospin asymmetry, highlighting the impact on the critical point and phase transition order.

Findings

Critical point temperature decreases with isospin asymmetry.

Critical point disappears at large isospin chemical potential.

Chiral phase transition in neutron star cores could be a crossover.

Abstract

We investigate the QCD phase diagram of isospin asymmetric matter using the Polyakov loop extended quark meson (PQM) model with vector interaction. The critical point temperature is found to decrease in isospin asymmetric matter and disappear at large isospin chemical potential. We also discuss the QCD phase transition in the neutron star core. From comparison of the QCD phase diagram in PQM and corresponding baryon and isospin chemical potentials of neutron star matter in relativistic mean field models, we show that the order of the chiral phase transition in the neutron star core could be crossover because of large isospin chemical potential.