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 constitu-ent 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
Key words
PNJL model/chiral phase transition/chiral chemical potential/magnetic field background
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