Phase structure of two-color QCD at real and imaginary chemical potentials; lattice simulations and model analyses

Abstract

We investigate the phase structure of two-color QCD at both real and imaginary chemical potentials mu, performing lattice simulations and analyzing the data with the Polyakov-loop extended Nambu--Jona-Lasinio (PNJL) model. Lattice QCD simulations are done on an 8^3 times 4 lattice with the clover-improved two-flavor Wilson fermion action and the renormalization-group improved Iwasaki gauge action. We test the analytic continuation of physical quantities from imaginary mu to real mu by comparing lattice QCD results calculated at real mu with the result of analytic function the coefficients of which are determined from lattice QCD results at imaginary mu. We also test the validity of the PNJL model by comparing model results with lattice QCD ones. The PNJL model is good in the deconfinement region, but less accurate in the transition and confinement regions. This problem is improved by introducing the baryon degree of freedom to the model. It is also found that the vector-type four-quark interaction is necessary to explain lattice data on the quark number density.

15 pages, 31 figures

References in corpus (15)

• The order of the quantum chromodynamics transition predicted by the standard model of particle physics
• Susceptibilities and speed of sound from PNJL model
• Can stochastic quantization evade the sign problem? -- the relativistic Bose gas at finite chemical potential
• Critical endpoint in the Polyakov-loop extended NJL model
• Phase structure of lattice QCD with two flavors of Wilson quarks at finite temperature and chemical potential
• Towards the phase diagram of dense two-color matter
• Polyakov loop extended NJL model with imaginary chemical potential
• Determination of QCD phase diagram from the imaginary chemical potential region
• Imaginary Chemical Potential Approach for the Pseudo-Critical Line in the QCD Phase Diagram with Clover-Improved Wilson Fermions
• Hadron Spectrum in a Two-Colour Baryon-Rich Medium
• Vector-type four-quark interaction and its impact on QCD phase structure
• The critical line from imaginary to real baryonic chemical potentials in two-color QCD
• 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
• Two-color QCD at imaginary chemical potential and its impact on real chemical potential

Cited by in corpus (13)

• Roberge-Weiss endpoint at the physical point of $N_f=2+1$ QCD
• Peaks of sound velocity in two color dense QCD: quark saturation effects and semishort range correlations
• Anomaly matching in QCD thermal phase transition
• New approach to canonical partition functions computation in $N_f=2$ lattice QCD at finite baryon density
• Roberge-Weiss endpoint and chiral symmetry restoration in $N_f=2+1$ QCD
• Thermal quarks and gluon propagators in two-color dense QCD
• Themodynamics for pure SU($2$) gauge theory using gradient flow
• Gauge-invariant screening masses and static quark free energies in $N_f=2+1$ QCD at non-zero baryon density
• Localization properties of Dirac modes at the Roberge-Weiss phase transition
• Equation of state and transition temperatures in the quark-hadron hybrid model
• Confronting effective models for deconfinement in dense quark matter with lattice data
• Classification of sign-problem-free relativistic fermions on the basis of the Majorana positivity
• Relative scale setting for two-color QCD with Nf=2 Wilson fermions