Polyakov loop effects on the phase diagram in strong-coupling lattice QCD

Abstract

We investigate the Polyakov loop effects on the QCD phase diagram by using the strong-coupling (1/g^2) expansion of the lattice QCD (SC-LQCD) with one species of unrooted staggered quark, including O}(1/g^4) effects. We take account of the effects of Polyakov loop fluctuations in Weiss mean-field approximation (MFA), and compare the results with those in the Haar-measure MFA (no fluctuation from the mean-field). The Polyakov loops strongly suppress the chiral transition temperature in the second-order/crossover region at small chemical potential, while they give a minor modification of the first-order phase boundary at larger chemical potential. The Polyakov loops also account for a drastic increase of the interaction measure near the chiral phase transition. The chiral and Polyakov loop susceptibilities have their peaks close to each other in the second-order/crossover region. In particular in Weiss MFA, there is no indication of the separated deconfinement transition boundary from the chiral phase boundary at any chemical potential. We discuss the interplay between the chiral and deconfinement dynamics via the bare quark mass dependence of susceptibilities.

17 pages, 17 figures

References in corpus (6)

• The phase structure of the Polyakov--quark-meson model beyond mean field
• Baryons and the phase diagram for a large number of colors and flavors
• The chiral critical point of Nf=3 QCD at finite density to the order (mu/T)^4
• The lattice QCD phase diagram in and away from the strong coupling limit
• Phase diagram evolution at finite coupling in strong coupling lattice QCD
• Chiral and deconfinement transitions in strong coupling lattice QCD with finite coupling and Polyakov loop effects

Cited by in corpus (7)

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• A new dual representation for staggered lattice QCD
• Strong Coupling Lattice QCD in the Continuous Time Limit
• Dual Formulation and Phase Diagram of Lattice QCD in the Strong Coupling Regime
• Strangeness content of the pion in the U(3) Nambu-Jona-Lasinio model
• Phenomenology with F-theory SU(5)
• Building models of quarks and gluons with an arbitrary number of colors using Cartan-Polyakov loops