论文标题
手性相变附近磁化QCD培养基的剪切粘度系数
Shear viscosity coefficient of magnetized QCD medium near chiral phase transition
论文作者
论文摘要
我们研究夸克物质的剪切粘度系数在有限的温度和较强背景磁场中手性相变的化学电位下的性质。强烈的磁场可引起各向异性特征，相位空间降水级量化，如果磁场足够强，则会干扰突出的QCD现象，例如动态夸克质量产生，可能会影响夸克物质传输特征。通过拟合晶格QCD（LQCD）结果，改良的Nambu-Jona-lasinio（NJL）模型具有逆磁催化效应，用于计算准粒子相关的热力学量的变化，以及在弛豫时间近似下分析系统培养基的剪切粘度。我们量化了手性相变的顺序和临界终点对这种磁化培养基中耗散现象的影响。当存在磁场时，耗散流体系统的剪切粘度系数可以分解为五个不同的组件。在强场上限制下，我们对$η_{2} $的依赖项和$η_{4} $在温度和磁场上的一阶相变和关键端点过渡的依赖性进行了详细研究。分别。发现$η_{2} $和$η_{4} $都随着磁场而降低，并且随温度的增加而增加，并且$η_{2} $和$η_{4} $的不连续性发生在第一阶相过渡点。
We study the properties of the shear viscosity coefficient of quark matter at finite temperature and chemical potential near chiral phase transition in a strong background magnetic field. A strong magnetic field induces anisotropic features, phase-space Landau-level quantization, and if the magnetic field is sufficiently strong, interferes with prominent QCD phenomena such as dynamical quark mass generation, likely affecting the quark matter transport characteristics. The modified Nambu-Jona-Lasinio (NJL) model with inverse magnetic catalysis effect by fitting the Lattice QCD (LQCD) results is used to calculate the changes of quasiparticle related thermodynamic quantities, and the shear viscosity of the system medium, which is analyzed under the relaxation time approximation. We quantify the influence of the order of chiral phase transition and the critical endpoint on dissipative phenomena in such a magnetized medium. When the magnetic field exists, the shear viscosity coefficient of the dissipative fluid system can be decomposed into five different components. In strong field limit, we make a detailed study of the dependencies of $η_{2}$ and $η_{4}$ on temperature and magnetic field for the first order phase transition and critical endpoint transition. respectively. It is found that $η_{2}$ and $η_{4}$ both decrease with magnetic field and increase with temperature, and the discontinuities of $η_{2}$ and $η_{4}$ occur at the first order phase transition point.
