Exploring the QCD phase diagram via reweighting from isospin chemical potential

Abstract

We investigate the QCD phase diagram for small values of baryon and strange quark chemical potentials from simulations at non-zero isospin chemical potential. Simulations at pure isospin chemical potential are not hindered by the sign problem and pion condensation can be observed for sufficiently large isospin chemical potentials. We study how the related phase boundary evolves with baryonic and strange chemical potentials via reweighting in quark chemical potentials and discuss our results. Furthermore, we propose and implement an alternative method to approach nonzero baryon (and strange quark) chemical potentials. This method involves simulations where physical quarks are paired with auxiliary quarks in unphysical "isospin" doublets and a decoupling of the auxiliary quarks by mass reweighting.

arXiv comment7 pages, 7 figures, Proceedings of the 37th International Symposium on Lattice Field Theory, Wuhan, China

References in corpus (7)

• Lattice QCD at non-zero isospin chemical potential
• The critical line of two-flavor QCD at finite isospin or baryon densities from imaginary chemical potentials
• Magnetic structure of isospin-asymmetric QCD matter in neutron stars
• Reliability of Taylor expansions in QCD
• Intriguing aspects of meson condensation
• New developments for dual methods in lattice field theory at non-zero density
• Lattice QCD at nonzero temperature and density

Cited by in corpus (2)

• Inhomogeneous phases in the chirally imbalanced $2+1$-dimensional Gross-Neveu model and their absence in the continuum limit
• Constraining the QCD phase diagram at finite temperature and density