Degrees of freedom and the phase transitions of two flavor QCD

Abstract

We study two effective models for QCD, the Nambu-Jona-Lasinio -model and the linear sigma model extended by including a Polyakov loop potential, which is fitted to reproduce pure gauge theory thermodynamics, and a coupling between the chiral fields and the Polyakov loop. Thus the resulting models have as relevant degrees of freedom the Polyakov loop and chiral fields. By comparing the extended models with the bare chiral models we can conclude that the addition of the Polyakov loop is necessary in order to obtain both qualitatively and quantitatively correct results at finite temperatures. These results are extended to finite net quark densities, several thermodynamical quantites are investigated in detail and possible applications and consequences for relativistic heavy ion collision phenomenology are discussed.

References in corpus (6)

• The Phase Structure of the Polyakov--Quark-Meson Model
• Susceptibilities and the Phase Structure of a Chiral Model with Polyakov Loops
• Has the QCD Critical Point been Signaled by Observations at RHIC ?
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• SU(3) Polyakov Linear Sigma-Model in an External Magnetic Field
• Effective models of two-flavor QCD: finite $\mu$ and $m_q$-dependence
• Influence of the Polyakov loop on the chiral phase transition in the two flavor chiral quark model
• Polyakov linear SU(3) sigma model: features of higher order moments in dense and thermal hadronic medium
• Color neutrality effects in the phase diagram of the PNJL model
• SU(3) Polyakov Linear $\sigma$-Model in Magnetic Field: Thermodynamics, Higher-Order Moments, Chiral Phase Structure and Meson Masses
• Quark Number Susceptibility : Revisited with Fluctuation-Dissipation Theorem in mean field theories
• Influence of finite volume effect on the Polyakov Quark-Meson model
• Thermodynamics and higher order moments in SU(3) linear $\sigma$-model with gluonic quasi-particles
• On-shell versus curvature mass parameter fixing schemes in the quark-meson model and its phase diagrams
• A PNJL model in 0+1 Dimensions