The QCD critical end point in the PNJL model

被引：61

作者：

Costa, P. ^{[1
,2
]}

de Sousa, C. A. ^{[1
]}

Ruivo, M. C. ^{[1
]}

Hansen, H. ^{[3
]}

机构：

[1] Univ Coimbra, Dept Fis, P-3004516 Coimbra, Portugal

[2] ESTG, Inst Politecn Leiria Morro do Lena Alto do Vieiro, P-2411901 Leiria, Portugal

[3] Univ Lyon, UCBL, CNRS, IN2P3,IPNL, F-69622 Villeurbanne, France

来源：

EPL | 2009年 / 86卷 / 03期

关键词：

CHIRAL-SYMMETRY RESTORATION; FINITE-TEMPERATURE; TRANSITIONS; DENSITY; PHASE;

D O I：

10.1209/0295-5075/86/31001

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We investigate the role played by the Polyakov loop in the dynamics of the chiral phase transition in the framework of the so-called Polyakov-Nambu-Jona-Lasinio (PNJL) model in the SU(2) sector. We present the phase diagram where the inclusion of the Polyakov loop moves the critical points to higher temperatures, compared with the Nambu-Jona-Lasinio model results. The critical properties of physical observables, such as the baryon number susceptibility and the specific heat, are analyzed in the vicinity of the critical end point, with special focus on their critical exponents. The results with the PNJL model are closer to lattice results and we also recover the universal behavior of the critical exponents of both the baryon susceptibility and the specific heat. Copyright (c) EPLA, 2009

引用

页数：6

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