Critical endpoint in the Polyakov-loop extended NJL model

Abstract

The critical endpoint (CEP) and the phase structure are studied in the Polyakov-loop extended Nambu--Jona-Lasinio model in which the scalar type eight-quark (σ^4) interaction and the vector type four-quark interaction are newly added. The σ^4 interaction largely shifts the CEP toward higher temperature and lower chemical potential, while the vector type interaction does oppositely. At zero chemical potential, the σ^4 interaction moves the pseudo-critical temperature of the chiral phase transition to the vicinity of that of the deconfinement phase transition.

13 pages, 6 figures embedded, accepted for publication in Phys. Lett. B

Cited by in corpus (4)

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• Phase diagram in the imaginary chemical potential region and extended Z3 symmetry
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• Vector-type four-quark interaction and its impact on QCD phase structure