Phase diagram in the imaginary chemical potential region and extended Z3 symmetry

Details Phase diagram in the imaginary chemical potential region and extended Z3 symmetry Phase diagram in the imaginary chemical potential region and extended Z3 symmetry

2008-03-13

arxiv.org/abs/0803.1902v2

Phys.Rev.D78:036001,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

22 pages,17 figures

Scientific paper

10.1103/PhysRevD.78.036001

Phase transitions in the imaginary chemical potential region are studied by the Polyakov loop extended Nambu-Jona-Lasinio (PNJL) model that possesses the extended Z3 symmetry. The extended Z3 invariant quantities such as the partition function, the chiral condensate and the modifed Polyakov loop have the Roberge-Weiss (RW) periodicity. There appear four types of phase transitions; deconfinement, chiral, Polykov-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 Polykov-loop RW and chiral RW transitions do not. The scalar-type eightquark interaction newly added in the model makes the chiral transition line shift to the vicinity of the deconfiment transition line.

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