Impact of vector-current interactions on the QCD phase diagram

Abstract

Using a nonlocal version of the Polyakov-loop-extended Nambu--Jona-Lasinio model, we investi- gate effects of a nonderivative vector-current interaction (relating to the quark-number density) at both real and imaginary chemical potentials. This repulsive vector interaction between quarks has the following impact on the chiral first-order phase transition: at imaginary chemical potential it sharpens the transition at the Roberge-Weiss (RW) end point and moves this critical point toward lower temperatures; at real chemical potential, the critical end point moves on a trajectory towards larger chemical potentials and lower temperatures with increasing vector coupling strength. The conditions are discussed at which the first-order phase transition disappears and turns into a smooth crossover.

6 pages, 4 figures

References in corpus (9)

• The Phase Structure of the Polyakov--Quark-Meson Model
• Thermodynamics of the PNJL model
• Phase structure of lattice QCD with two flavors of Wilson quarks at finite temperature and chemical potential
• Dual quark condensate and dressed Polyakov loops
• Polyakov loop extended NJL model with imaginary chemical potential
• Chiral phase transition in an extended NJL model with higher-order multi-quark interactions
• Nonlocal chiral quark models with wavefunction renormalization: sigma properties and π-πscattering parameters
• The Roberge-Weiss endpoint in N_f = 2 QCD
• Extensions and further applications of the nonlocal Polyakov--Nambu--Jona-Lasinio model

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• Thermodynamic phases and mesonic fluctuations in a chiral nucleon-meson model
• Medium induced Lorentz symmetry breaking effects in nonlocal PNJL models
• Polyakov-Nambu-Jona-Lasinio phase diagrams and quarkyonic phase from order parameters
• Massive Neutron Stars with a Color Superconducting Quark Matter Core
• PNJL model at zero temperature: three-flavor case
• Vector and axial vector mesons in a nonlocal chiral quark model
• Nonlocal PNJL models and heavy hybrid stars
• Sensitivity of predictions in an effective model -- application to the chiral critical end point position in the Nambu--Jona-Lasinio model