A finite-density transition line for QCD with 695 MeV dynamical fermions

Abstract

We apply the relative weights method to SU(3) gauge theory with staggered fermions of mass 695 MeV at a set of temperatures in the range $151\le T\le 267$ MeV, to obtain an effective Polyakov line action at each temperature. We then apply a mean-field method to search for phase transitions in the effective theory at finite densities. The result is a transition line in the plane of temperature and chemical potential, with an endpoint at high temperature, as expected, but also a second endpoint at a lower temperature. We cannot rule out the possibilities that a transition line reappears at temperatures lower than the range investigated, or that the second endpoint is absent for light quarks.

11 pages, 9 figures. v2: references added, minor cosmetic changes, and a small numerical correction in the appendix. v3: significant revisions in procedure, figures added, some comparison with other results in the literature. v4: corrected one citation and minor misprint

References in corpus (8)

• Flux representation of an effective Polyakov loop model for QCD thermodynamics
• Comparison of complex Langevin and mean field methods applied to effective Polyakov line models
• The QCD phase diagram in the limit of heavy quarks using complex Langevin dynamics
• A Model for QCD at High Density and Large Quark Mass
• Inverse Monte-Carlo determination of effective lattice models for SU(3) Yang-Mills theory at finite temperature
• Relative weights approach to SU(3) gauge theories with dynamical fermions at finite density
• $\xi /{\xi }_{2nd}$ ratio as a tool to refine Effective Polyakov Loop models
• Non-Local effective SU(2) Polyakov-loop models from inverse Monte-Carlo methods

Cited by in corpus (3)

• Anomaly matching in QCD thermal phase transition
• Roberge-Weiss endpoint and chiral symmetry restoration in $N_f=2+1$ QCD
• Constrained Hybrid Monte Carlo algorithms for gauge-Higgs models