Pion superfluidity and meson properties at finite isospin density

Journal Article · Wed Jun 01 04:00:00 EDT 2005 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PhysRevD.71.116001· OSTI ID:20709496

Lianyi, He; Meng, Jin; Pengfei, Zhuang ^[1]

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1. Physics Department, Tsinghua University, Beijing 100084 (China)

We investigate pion superfluidity and its effect on meson properties and equation of state at finite temperature and isospin and baryon densities in the frame of a standard flavor SU(2) NJL model. In mean field approximation to quarks and random phase approximation to mesons, the critical isospin chemical potential for pion superfluidity is exactly the pion mass in the vacuum, and corresponding to the isospin symmetry spontaneous breaking, there is in the pion superfluidity phase a Goldstone mode which is the linear combination of the normal sigma and charged pion modes. We calculate numerically the gap equations for the chiral and pion condensates, the phase diagrams, the meson spectra, and the equation of state, and compare them with that obtained in other effective models. The competitions between pion superfluidity and color superconductivity at finite baryon density and between pion and kaon superfluidity at finite strangeness density in flavor SU(3) NJL model are briefly discussed.

• OSTI ID: 20709496
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 11 Vol. 71; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
CHIRALITY
COLOR MODEL
COMPARATIVE EVALUATIONS
DENSITY
EQUATIONS OF STATE
FLAVOR MODEL
ISOSPIN
KAONS
MEAN-FIELD THEORY
MESON SPECTROSCOPY
PHASE DIAGRAMS
PIONS
POTENTIALS
QUARKS
RANDOM PHASE APPROXIMATION
STRANGENESS
SUPERCONDUCTIVITY
SUPERFLUIDITY
SYMMETRY