Violations of parity and charge conjugation in the {theta} vacuum with imaginary chemical potential

Journal Article · Fri Apr 01 04:00:00 EDT 2011 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.83.076009· OSTI ID:21537764

Kouno, Hiroaki ^[1]; Sakai, Yuji; Sasaki, Takahiro; Kashiwa, Kouji; Yahiro, Masanobu ^[2]

---

1. Department of Physics, Saga University, Saga 840-8502 (Japan)
2. Department of Physics, Graduate School of Sciences, Kyushu University, Fukuoka 812-8581 (Japan)

Charge conjugation (C) and parity (P) are exact symmetries at {theta}={pi} and {Theta}{identical_to}{mu}/(iT)={pi}, where {theta} is the parameter of the so-called {theta} vacuum, {mu} is the imaginary quark-number chemical potential and T is the temperature. Spontaneous breakings of these discrete symmetries are investigated by the Polyakov-loop extended Nambu-Jona-Lasinio model. At zero T, P symmetry is spontaneously broken while C symmetry is conserved. As T increases, P symmetry is restored just after C symmetry is spontaneously broken, so that either P or C symmetry or both the symmetries are spontaneously broken for any T. The chiral-symmetry restoration and the deconfinement transition at {theta}={Theta}=0 are remnants of the P restoration and the C breaking at {theta}={Theta}={pi}, respectively.

• OSTI ID: 21537764
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 7 Vol. 83; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHIRAL SYMMETRY
FERMIONS
PARITY
PARTICLE PROPERTIES
QUARKS
SIMULATION
SYMMETRY
SYMMETRY BREAKING
TEMPERATURE DEPENDENCE