跑动耦合常数下夸克物质的压缩系数  

Compressibility of Quark Matter with Running Coupling

作　　者：杨丽 李名璋 陈亚慧 YANG Li;LI Mingzhang;CHEN Yahui(Department of Physics and Electronic Engineering,Jinzhong University,Jinzhong 030619,China;Department of Physics,College of Basic Medical Sciences,Army Medical University,Chongqing 400038,China)

机构地区：[1]晋中学院物理与电子工程系,山西晋中030619 [2]陆军军医大学基础医学院物理学教研室,四川重庆400038

出　　处：《山西大学学报（自然科学版）》2024年第6期1221-1227,共7页Journal of Shanxi University(Natural Science Edition)

基　　金：国家自然科学基金(11947040);山西省高等学校教学改革创新项目(J20221070);晋中学院博士基金资助项目(jzxybsjjxm2019011)。

摘　　要：本文主要研究磁场和温度依赖的跑动耦合常数在两味Nambu Jona-Lasinio(NJL)模型中,强磁场下夸克物质的压缩系数。研究结果表明:垂直于磁场方向的压缩系数和平行于磁场方向的压缩系数随化学势变化的不连续性都可以暗示手征一阶相变,跑动耦合常数会影响夸克物质手征一阶相变发生的位置。在手征对称恢复相,垂直于磁场方向的压缩系数随温度的升高而减小,平行于磁场方向的压缩系数随温度几乎保持不变。当磁感应强度B<10^(15)T时,垂直于磁场方向的压缩系数和平行于磁场方向的压缩系数几乎相等且不随磁场变化;磁场足够强时,垂直于磁场方向的压缩系数随磁场的增强急剧增大,而平行于磁场方向的压缩系数则平缓减小。The compressibility of quark matter in a strong magnetic field is investigated in two flavour Nambu-Jona-Lasinio(NJL)model with a magnetic-field-and the temperature-dependent running coupling.The results show that the discontinuities of the perpendicular/parallel compressibility with the chemical potential can indicate the chiral first order phase transition.The running coupling will influence the location of the chiral first order phase transition.In chiral symmetry restored phase,the perpendicular compressibility decreases with the temperature increasing,while the parallel compressibility keeps almost constant with increasing temperature.When the magnetic induction is less than 10^(15) T,the parallel compressibility and perpendicular compressibility are almost equal and does not change with the magnetic field;however,the magnetic field is strong enough,as the magnetic field increase,and the perpendicular compressibility increases while the parallel compressibility decreases gently.

关 键 词：夸克物质 NJL模型 量子色动力学 强磁场 

分 类 号：O413[理学—理论物理]