Imaginary Chemical Potential Approach for the Pseudo-Critical Line in the QCD Phase Diagram with Clover-Improved Wilson Fermions

Abstract

The QCD phase diagram is studied in the lattice QCD simulation with the imaginary chemical potential approach. We employ a clover-improved Wilson fermion action of two-flavors and a renormalization-group improved gauge action, and perform the simulation at an intermediate quark mass on a $8^3\times 4$ lattice. The QCD phase diagram in the imaginary chemical potential ${\mu }_I$ region is investigated by performing the simulation for more than 150 points on the $(\beta ,{\mu }_I)$ plane. We find that the Roberge-Weiss phase transition at ${\mu }_I/T=\pi /3$ is first order and its endpoint is second order, which are identified by the phase of the Polyakov loop. We determine the pseudo-critical line from the susceptibility of the Polyakov loop modulus. We find a clear deviation from a linear dependence of the pseudo-critical line on ${\mu }_I^2$.

10 pages, 20 figures, 3 tables. Revtex4. References are added and, discussions are sharpened

References in corpus (6)

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• Polyakov loop extended NJL model with imaginary chemical potential
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Cited by in corpus (18)

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• Anomaly matching in QCD thermal phase transition
• Lee-Yang zero distribution of high temperature QCD and Roberge-Weiss phase transition
• Quark number densities at imaginary chemical potential in $N_f=2$ lattice QCD with Wilson fermions and its model analyses
• Determination of the strength of the vector-type four-quark interaction in the entanglement Polyakov-extended Nambu-Jona-Lasino model
• High-temperature domain walls of QCD with imaginary chemical potentials
• Nature of Roberge-Weiss transition end points for heavy quarks in $N_f=2$ lattice QCD with Wilson fermions
• Finite-Density Massless Two-Color QCD at Isospin Roberge-Weiss Point and 't Hooft Anomaly
• Towards extremely dense matter on the lattice
• Complex singularities around the QCD critical point at finite densities
• Multiplicity, probabilities, and canonical sectors for the cold QCD matter
• The curvature of the pseudo-critical line in the QCD phase diagram from mesonic lattice correlation functions
• Two-flavor QCD at finite quark or isospin density
• Nonanalyticity, sign problem and Polyakov line in Z3-symmetric heavy quark model at low temperature: Phenomenological model analyses
• Low temperature limit of lattice QCD