Phase diagram in the imaginary chemical potential region and extended Z 3 symmetry
Phase diagram in the imaginary chemical potential region and extended Z 3 symmetry
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DOI：
10.1103/physrevd.78.036001
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发表时间：
2008-03
影响因子：
5
通讯作者：
Y. Sakai;K. Kashiwa;H. Kouno;M. Yahiro
中科院分区：
文献类型：
--
作者：
Y. Sakai;K. Kashiwa;H. Kouno;M. Yahiro
利用具有扩展Z{sub 3}对称性的Polyakov圈扩展Nambu-Jona-Lasinio模型研究了虚化学势区的相变.扩展Z {sub 3}不变量如配分函数、手征凝聚和修正的Polyakov环具有Roberge-Weiss（RW）周期性。有四种类型的相变：解除禁闭，手征，Polyakov环RW和手征RW过渡。手征跃迁和去禁闭跃迁的阶数依赖于当前夸克质量的存在与否，而Polyakov圈RW跃迁和手征RW跃迁的阶数则不依赖于当前夸克质量的存在与否。模型中新加入的标量型八夸克相互作用使手征跃迁线向退禁闭跃迁线附近移动。
Phase transitions in the imaginary chemical potential region are studied by the Polyakov-loop extended Nambu-Jona-Lasinio model that possesses the extended Z{sub 3} symmetry. The extended-Z{sub 3} invariant quantities such as the partition function, the chiral condensate, and the modified Polyakov loop have the Roberge-Weiss (RW) periodicity. There appear four types of phase transitions: deconfinement, chiral, Polyakov-loop RW, and chiral RW transitions. The orders of the chiral and deconfinement transitions depend on the presence or absence of current quark mass, but those of the Polyakov-loop RW and chiral RW transitions do not. The scalar-type, eight-quark interaction newly added in the model makes the chiral transition line shift to the vicinity of the deconfinement transition line.