Phases of QCD: Lattice thermodynamics and a field theoretical model

Claudia Ratti, Michael A. Thaler, and Wolfram Weise
Phys. Rev. D 73, 014019 – Published 20 January 2006

Abstract

We investigate three-color QCD thermodynamics at finite quark chemical potential. Lattice QCD results are compared with a generalized Nambu Jona-Lasinio model in which quarks couple simultaneously to the chiral condensate and to a background temporal gauge field representing Polyakov loop dynamics. This so-called PNJL model thus includes features of both deconfinement and chiral symmetry restoration. The parameters of the Polyakov loop effective potential are fixed in the pure-gauge sector. The chiral condensate and the Polyakov loop as functions of temperature and quark chemical potential are calculated by minimizing the thermodynamic potential of the system. The resulting equation of state, (scaled) pressure difference and quark number density at finite quark chemical potential are then confronted with corresponding Lattice QCD data.

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  • Received 1 July 2005

DOI:https://doi.org/10.1103/PhysRevD.73.014019

©2006 American Physical Society

Authors & Affiliations

Claudia Ratti1,2,*, Michael A. Thaler1,†, and Wolfram Weise1,‡

  • 1Physik-Department, Technische Universität München, D-85747 Garching, Germany
  • 2ECT*, I-38050 Villazzano (Trento), Italy

  • *Electronic address: Claudia_Ratti@ph.tum.de
  • Electronic address: Michael_Thaler@ph.tum.de
  • Electronic address: Wolfram_Weise@ph.tum.de

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Vol. 73, Iss. 1 — 1 January 2006

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