热磁背景下的夸克凝聚和相变的反磁催化特性  

Inverse Magnetic Catalysis of Quark Condensation and Phase Transition in Thermomagnetic Background

作　　者：朱学强 冯笙琴[1] 吴科军[1] ZHU Xueqiang;FENG Shengqin;WU Kejun(College of Science,China Three Gorges University,Yichang 443000,China)

机构地区：[1]三峡大学理学院,湖北宜昌443000

出　　处：《湖北民族大学学报（自然科学版）》2021年第4期451-455,共5页Journal of Hubei Minzu University:Natural Science Edition

基　　金：国家自然科学基金项目(11875178;11747115);华中师范大学夸克与轻子物理教育部重点实验室开放基金项目(QLPL201905).

摘　　要：虽然渐近自由特征是量子色动力学(quantum chromodynamics,QCD)的一个基本特征,但一般有效的手征夸克模型(比如说NJL(Nambu-Jona-Lasinio)和线性Sigma模型)都认为耦合常数G是一个常数,忽略了QCD渐进自由特征.用NJL模型研究夸克物质在有限温度和强磁场环境下的凝聚和手征相变特性时,引进QCD渐近自由特征并假设耦合常数G是随温度T和磁场B而变化的函数.通过拟合零化学势的格点QCD的数据,给出耦合常数G具体形式.在得到耦合常数的具体形式后,进一步计算了有限大小化学势的夸克凝聚和相变等特性,并发现磁场有明显的反磁催化特征,即发现相变温度随磁场增加而减小,所得结果与格点QCD预言的反磁催化特性一致.Although the asymptotic free characteristic is a basic characteristic of quantum chromodynamics(QCD),the general effective chiral quark models(such as NJL(Nambu-Jona-Lasinio)and Linear sigma model)take the coupling constant G as a constant and ignore the asymptotic free characteristic of QCD.In this paper,when NJL model is used to study the quark condensation and chiral phase transition of quark matter in the environment of finite temperature and strong magnetic field,we assume that the coupling constant G decreases with the increase of temperature T and magnetic field B.By fitting the lattice QCD(LQCD)at zero chemical potential,the specific form of coupling constant G is given.After obtaining the specific form of coupling constant,we further calculate the quark condensation and phase transition of finite chemical potential,and find that the magnetic field has obvious inverse magnetic catalytic characteristics,which is consistent with prediction given by LQCD.

关 键 词：NJL模型 耦合常数G 反磁催化 夸克凝聚 相变 

分 类 号：O572.21[理学—粒子物理与原子核物理]