强磁场背景下手征相变点附近的剪切粘滞系数研究  

Shear Viscosity Coefficient Near Chiral Phase Transition in a Strong Magnetic Field Background

作　　者：熊涛 靖晶 江泽方 冯笙琴[1] Xiong Tao;Jing Jing;Jiang Zefang;Feng Shengqin(School of Science,China Three Gorges University,Yichang,Hubei 443002,China;School of Physics and Electronic Information Engineering,Hubei Engineering University,Xiaogan,Hubei 432000,China)

机构地区：[1]三峡大学理学院,湖北宜昌443002 [2]湖北工程学院物理与电子信息学院,湖北孝感432000

出　　处：《湖北工程学院学报》2024年第6期117-123,共7页Journal of Hubei Engineering University

基　　金：国家自然科学基金项目(12305138,11875178)。

摘　　要：剪切粘滞系数?是定量描述外磁场背景下量子色动力学(Quantum Chromodynamics,QCD)流体动力学耗散程度的重要参数,?对磁化QCD介质中的相变特性非常敏感。利用磁化QCD介质的反常磁矩的NJL(Nambu-Jona-Lasinio)模型,系统研究剪切粘滞系数分别在手征一级相变和临界相变时的变化特征。结果表明,磁化背景的剪切粘滞系数的各向异性四个分量均随温度升高而增大。对于一阶相变,剪切粘滞系数表现出不连续变化的特征,研究的结果与格点QCD理论研究结果一致。The shear viscosity coefficient(η)is an important parameter for quantitatively describing the degree of fluid dynamics dissipation of QCD under an external magnetic field background.It is worth noting that theηis very sensitive to the phase transition characteristics in magnetized QCD media.The NJL(Nambu Jona Lasinio)model with anomalous magnetic moment in magnetized QCD media is utilized to systematically study the characteristics of shear viscosity coefficient during chiral first-order phase transition and critical phase transition respectively.The results indicate that the four components of the shear viscosity coefficient of the magnetized background increases with increasing temperature.For first-order phase transitions,the shear viscosity coefficient exhibits discontinuous changes and the research results are consistent with those of lattice QCD theory.

关 键 词：NJL模型 剪切粘滞系数 反常磁矩 相变 

分 类 号：O57[理学—粒子物理与原子核物理]