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)

• The strongly interacting Quark Gluon Plasma, and the critical behaviour of QCD at imaginary chemical potential
• Phase structure of lattice QCD with two flavors of Wilson quarks at finite temperature and chemical potential
• Polyakov loop extended NJL model with imaginary chemical potential
• Analytic continuation of the critical line: suggestions for QCD
• Status of Lattice Studies of the QCD Phase Diagram
• The critical line from imaginary to real baryonic chemical potentials in two-color QCD

Cited by in corpus (3)

• Towards extremely dense matter on the lattice
• Two-flavor QCD at finite quark or isospin density
• Low temperature limit of lattice QCD