The electromagnetic field effects in inout and inin formalisms
Abstract
In this work, we compare the effects of electromagnetic (EM) fields on strong coupling systems in two formalisms: inout and inin, which are different from each other when a finite electric field is present. The chiral effective NambuJonaLasinio model is adopted for this study, and two kinds of EM field distributions are considered: pure electric field and parallel EM (PEM) field with equal electric and magnetic components. For both distributions, we find that the results of inout and inin formalisms start to diverge when the electric field ^{(qE) 1 / 2} is larger than the chiral effective mass M =^{[m2 +(π0)2 ] 1 / 2}, that is, when the Schwinger pair production mechanism becomes important. Besides, the chiral restorations are stiffer in the inin formalism, especially the transition shifts to firstorder instead of the secondorder for the PEM field. The neutral collective modes are also explored accordingly: For the PEM field, more precise calculations show nonmonotonic features of their pole masses due to parity mixing, and then the Goldstonelike mode is found to be noneffective at the end of chiral rotation because of chiral anomaly.
 Publication:

Physics Letters B
 Pub Date:
 July 2020
 DOI:
 10.1016/j.physletb.2020.135477
 arXiv:
 arXiv:1912.11971
 Bibcode:
 2020PhLB..80635477C
 Keywords:

 Nuclear Theory
 EPrint:
 doi:10.1016/j.physletb.2020.135477