Two-color QCD at imaginary chemical potential and its impact on real chemical potential

Kouji Kashiwa, Takahiro Sasaki, Hiroaki Kouno, Masanobu Yahiro

Research output: Contribution to journalArticle

12 Citations (Scopus)

Abstract

We study properties of two-color QCD at imaginary chemical potential (μ) from the viewpoint of the Roberge-Weiss periodicity, the charge conjugation, and the pseudoreality. At μ=±iπT/2, where T is temperature, the system is symmetric under the combination of the charge conjugation C and the Z2 transformation. The symmetry, called CZ2 symmetry, is preserved at lower T but spontaneously broken at higher T. The Polyakov-loop extended Nambu-Jona-Lasinio model has the same properties as two-color QCD for CZ2 symmetry and the pseudoreality. The nontrivial correlation between the chiral restoration and the deconfinement are investigated by introducing the entanglement vertex in the Polyakov-loop extended Nambu-Jona-Lasinio model. The order of CZ2 symmetry breaking at the Roberge-Weiss end point is second order when the correlation is weak, but becomes first order when the correlation is strong. We also investigate the impact of the correlation on the phase diagram at real μ.

Original languageEnglish
Article number016015
JournalPhysical Review D - Particles, Fields, Gravitation and Cosmology
Volume87
Issue number1
DOIs
Publication statusPublished - Jan 24 2013

All Science Journal Classification (ASJC) codes

  • Nuclear and High Energy Physics
  • Physics and Astronomy (miscellaneous)

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