Phases of QCD: lattice thermodynamics and a field theoretical model
Phases of QCD: lattice thermodynamics and a field theoretical model
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DOI：
10.1103/physrevd.73.014019
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发表时间：
2005-06
影响因子：
5
通讯作者：
C. Ratti;M. Thaler;W. Weise
中科院分区：
文献类型：
--
作者：
C. Ratti;M. Thaler;W. Weise
我们研究了有限夸克化学势下的三色QCD热力学。格点QCD的结果进行了比较与广义Nambu Jona-Lasinio模型中，夸克耦合同时手征凝聚体和一个背景的时间规范场代表Polyakov圈动力学。因此，这种所谓的PNJL模型包括解除禁闭和手征对称性恢复的特征。在纯规范区，Polyakov回路有效势的参数是固定的。通过最小化系统的热力学势，计算了手征凝聚体和Polyakov圈随温度和夸克化学势的变化。最后，将得到的有限夸克化学势下的物态方程、（标度）压差和夸克数密度与相应的格点QCD数据进行了比较。
We investigate three-color QCD thermodynamics at finite quark chemical potential. Lattice QCD results are compared with a generalized Nambu Jona-Lasinio model in which quarks couple simultaneously to the chiral condensate and to a background temporal gauge field representing Polyakov loop dynamics. This so-called PNJL model thus includes features of both deconfinement and chiral symmetry restoration. The parameters of the Polyakov loop effective potential are fixed in the pure-gauge sector. The chiral condensate and the Polyakov loop as functions of temperature and quark chemical potential are calculated by minimizing the thermodynamic potential of the system. The resulting equation of state, (scaled) pressure difference and quark number density at finite quark chemical potential are then confronted with corresponding Lattice QCD data.