From Inverse to Delayed Magnetic Catalysis in Strong Magnetic Field

TL;DR

This paper investigates how quantum fluctuations of mesons influence the magnetic catalysis phenomenon in chiral phase transitions, revealing a shift from inverse to delayed magnetic catalysis and a non-monotonous dependence of the critical end point on magnetic field strength.

Contribution

It introduces mesonic quantum fluctuations into the NJL model, demonstrating their impact on magnetic catalysis and the phase diagram of QCD matter under strong magnetic fields.

Findings

Quantum fluctuations delay the magnetic catalysis transition.

The critical end point's location varies non-monotonously with magnetic field.

Inclusion of mesons alters the phase transition behavior significantly.

Abstract

We study magnetic field effect on chiral phase transition in a Nambu--Jona-Lasinio model. In comparison with mean field approximation containing quarks only, including mesons as quantum fluctuations in the model leads to a transition from inverse to delayed magnetic catalysis at finite temperature and delays the transition at finite baryon chemical potential. The location of the critical end point depends on the the magnetic field non-monotonously.