磁场背景下具有手征化学势的PNJL模型下的手征相变  

Chiral phase transition of PNJL model with chiral chemical potential under magnetic field

作　　者：陈建兴[1] 赵博 张馨 常晓婷 CHEN Jianxing;ZHAO Bo;ZHANG Xin;CHANG Xiaoting(School of Physics and Electronic Technology,Liaoning Normal University,Dalian 116029,China)

机构地区：[1]辽宁师范大学物理与电子技术学院,辽宁大连116029

出　　处：《辽宁师范大学学报（自然科学版）》2024年第3期311-318,共8页Journal of Liaoning Normal University:Natural Science Edition

基　　金：辽宁师范大学理论物理学术交流和人才培养建设平台项目(12047570)。

摘　　要：采用具有两个味道的PNJL模型研究了均匀磁场背景下的手征相变,特别是磁场对手征相变的临界手征化学势的影响.结果表明,磁场对手征对称性自发破缺具有催化作用,即临界手征化学势随着磁场增大而增大.夸克的组分质量随磁场增大,但它随手征化学势的变化不一定是单调的,在接近临界手征化学势时,夸克的组分质量会单调减小,直至发生手征相变.同时也讨论了体积对临界手征化学势的影响,发现在简化处理方式下,系统尺度的减小会导致临界手征化学势的明显增大.In this paper,we use a two-flavor PNJL model to study chiral phase transition in a uniform magnetic field background,especially investigate the influence of the magnetic field on critical chiral chemical potential.It is shown that the magnetic field catalyzes the spontaneous symmetry breaking,where the critical chiral chemical potential increases with the increasing magnetic field.The constituent masses of quarks increase with the magnetic field,but their change with chiral chemical potential is not necessarily monotonic.Near the critical chiral chemical potential,the constituent masses of quarks decrease monotonically until the chiral phase transition occurs.We also discuss the effect of volume on the critical chiral chemical potential and find that the reduction of the system scale leads to a remakable increase of the critical chiral chemical potential under our simplified treatment.

关 键 词：PNJL模型 手征相变 手征化学势 磁场背景 

分 类 号：O572.33[理学—粒子物理与原子核物理]