Average phase factor in the PNJL model

Details Average phase factor in the PNJL model Average phase factor in the PNJL model

2010-05-06

arxiv.org/abs/1005.0993v1

Phys.Rev.D82:096007,2010

Physics

High Energy Physics

High Energy Physics - Phenomenology

8 pages, 6 figures

Scientific paper

10.1103/PhysRevD.82.096007

The average phase factor of the QCD determinant is evaluated at finite quark chemical potential ({\mu}_q) with the two-flavor version of the Polyakov-loop extended Nambu-Jona-Lasinio (PNJL) model with the scalar-type eight-quark interaction. For {\mu}_q larger than half the pion mass at vacuum m_{\pi}, the average phase factor is finite only when the Polyakov loop is larger than 0.5, indicating that lattice QCD is feasible only in the deconfinement phase. A critical endpoint (CEP) lies in the region of the zero average phase factor. The scalar-type eight-quark interaction makes it shorter a relative distance of the CEP to the boundary of the region. For {\mu}_q < m_{\pi}/2, the PNJL model with dynamical mesonic fluctuations can reproduce lattice QCD data below the critical temperature.

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