# Nuclear Science and Techniques

《核技术》(英文版) ISSN 1001-8042 CN 31-1559/TL     2019 Impact factor 1.556

Nuclear Science and Techniques ›› 2016, Vol. 27 ›› Issue (6): 130

• Special Section on International Workshop on Nuclear Dynamics in Heavy-Ion Reaction (IWND2016) •

### Chiral phase transition of quark matter in the background of parallel electric and magnetic fields

M. Ruggieri 1 Guang-Xiong Peng 1，2

1. 1 College of Physics, University of Chinese Academy of Sciences, Yuquanlu 19A, Beijing 100049, China
2 Theoretical Physics Center for Science Facilities, Institute of High Energy Physics, Beijing 100049, China
• Contact: M. Ruggieri E-mail:marco.ruggieri@ucas.ac.cn
• Supported by:

This work was supported by the CAS President’s International Fellowship Initiative (No. 2015PM008), and the National Natural Science Foundation of China (Nos. 11135011 and 11575190).

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M. Ruggieri, Guang-Xiong Peng. Chiral phase transition of quark matter in the background of parallel electric and magnetic fields.Nuclear Science and Techniques, 2016, 27(6): 130

Abstract:

We report on our results about spontaneous chiral symmetry breaking for quark matter in the background of static and homogeneous parallel electric field, EEEE, and magnetic field, BBBB. A Nambu–Jona–Lasinio model is used to compute the dependence of the chiral condensate at finite temperature, E and B. We study the effect of this background on inverse catalysis of chiral symmetry breaking for E and B of the same order of magnitude. We also consider the effect of equilibration of chiral density, n5n5, produced by axial anomaly on the critical temperature. The equilibration of n5n5 allows for the introduction of the chiral chemical potential, μ5μ5, which is computed self-consistently as a function of temperature and field strength. We find that even if the chiral medium is produced by the fields the thermodynamics, with particular reference to the inverse catalysis induced by the external fields, it is not very affected by n5n5 at least if the average μ5μ5, at equilibrium is not too large.