Magnetic-Field Induced Critical Endpoint

TL;DR

This paper investigates how external magnetic fields and isospin chemical potentials affect the phase diagram of strong interaction matter using the Nambu--Jona-Lasinio model, revealing magnetic-field-induced critical points.

Contribution

It introduces a detailed analysis of magnetic and isospin effects on the phase diagram, highlighting the emergence of new critical points or triple points.

Findings

Magnetic fields can induce a new critical endpoint at low temperatures.

Isospin breaking effects are significant in the phase structure.

The phase diagram is sensitive to magnetic field strength and chemical potential.

Abstract

The phase diagram of strong interaction matter is analyzed utilizing the Nambu--Jona-Lasinio model. Special emphasis is placed on its dependence on an external magnetic field and isospin chemical potential. Using flavor mixing induced by instanton effects the influence of isospin breaking due to the magnetic field and the isospin chemical potential is compared. It is found that at low temperatures and large quark chemical potential the magnetic field, depending on its strength, induces a new critical endpoint or a triple point.