QCD phase transition with non-extensive NJL model in the strong magnetic field

TL;DR

This paper investigates how non-extensive statistical mechanics, modeled via Tsallis distribution, influences the thermodynamic properties and phase transition behavior of magnetized three-flavor quark matter within the NJL framework, revealing effects on temperature, pressure, magnetization, and phase transition characteristics.

Contribution

It introduces the application of the non-extensive Tsallis distribution to the NJL model under strong magnetic fields, analyzing its impact on thermodynamic properties and phase transitions.

Findings

Crossover transition occurs for all non-extensive parameters q.

Pseudo-critical temperature decreases with increasing q.

Magnetization varies significantly with temperature and magnetic field.

Abstract

In this work we make use of the Nambu-Jona-Lasinio model to investigate thermodynamic properties of magnetized three-flavor quark matter. The non-equilibrium Tsallis distribution is characterized by a dimensionless non-extensive parameter $q$. We find that the system always undergoes a crossover transition for all given $q$ values and the pseudo-critical temperature decreases with the increasing non-extensive parameter. We show that the variation of the pressure and its anisotropy in parallel and perpendicular directions. However, the diamagnetic nature appears within a certain temperature range at zero chemical potential. Moreover, strong magnetic fields can affect the property of a non-extensive system by changing the magnetization significantly. At high temperatures, the paramagnetic nature always occur no matter how strong the magnetic field is. Finally, we study the effects of non-extensive parameter $q$ on the trace anomaly and the speed of sound of the system.