Affiliation:
1. University of Chinese Academy of Sciences
2. Institute of High Energy Physics
3. Xi’an Jiaotong University
Abstract
In the framework of the Nambu–Jona-Lasinio model beyond mean field approximation, the effects of pion fluctuations on (inverse) magnetic catalysis and magnetic susceptibility are studied. The negative magnetic susceptibility at low temperature is observed when contributions from both neutral and charged pions are taken into account. In the weak field approximation, it is observed that at finite temperature, the magnetic inhibition effect in the chiral limit, resulting from the difference between the transverse and longitudinal velocities of neutral pions, converts to weak magnetic catalysis when considering a nonzero current quark mass. Moreover, the magnetic catalysis is amplified by the charged pions. Therefore, no inverse magnetic catalysis is observed when considering pion fluctuations.
Published by the American Physical Society
2024
Funder
National Natural Science Foundation of China
Chinese Academy of Sciences
Fundamental Research Funds for the Central Universities
Publisher
American Physical Society (APS)