报告题目：Phase transition in three flavor QCD with background magnetic field

报 告 人：Dr. Akio Tomiya (富谷昭夫)
工作单位：RIKEN-BNL, USA

报告时间: 2019年09月24日 15：00
报告地点：中心校区 物理楼 345室

摘要： In this talk, I introduce a phase transition in three flavor QCD under strong magnetic field. We investigate the order of this transition using unimproved and highly improved staggered quarks (HISQ). We discuss the dependences of chiral condensates and susceptibilities and the Polyakov loop on the volume, quark mass and the magnitude of magnetic field. The lattice simulations are performed with several spatial sizes and a fixed temporal size Nt= 4 (Nt=6 for HISQ). The value of the quark masses are chosen such that the system undergoes crossover with zero magnetic field in both formulations. We find that for the standard staggered quarks, the quark chiral condensate undergoes magnetic catalysis in the whole temperature region and the phase transition becomes stronger as the magnetic field increases. The Binder cumulant supports this observation. For the HISQ action, the inverse magnetic catalysis is observed in the critical temperature region and the phase transition tends to become stronger as the magnetic field increases. However, the Binder cumulant does not shows any criticality even for our strongest magnetic field.

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