BEC-BCS crossover in the Nambu-Jona-Lasinio model of QCD

Journal Article · Tue May 01 04:00:00 EDT 2007 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.75.096004· OSTI ID:21020517

Gaofeng, Sun; Lianyi, He; Pengfei, Zhuang ^[1]

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

The BEC-BCS (Bose-Einstein condensation-Bardeen-Cooper-Shriffer) crossover in QCD at finite baryon and isospin chemical potentials is investigated in the Nambu-Jona-Lasinio model. The diquark condensation in two color QCD and the pion condensation in real QCD would undergo a BEC-BCS crossover when the corresponding chemical potential increases. We determined the crossover chemical potential as well as the BEC and BCS regions. The crossover is not triggered by increasing the strength of attractive interaction among quarks but driven by changing the charge density. The chiral symmetry restoration at finite temperature and density plays an important role in the BEC-BCS crossover. For real QCD, strong couplings in diquark and vector meson channels can induce a diquark BEC-BCS crossover in color superconductor, and in the BEC region the chromomagnetic instability is fully cured and the ground state is a uniform phase.

• OSTI ID: 21020517
• Journal Information: Physical Review. D, Particles Fields, Journal Name: Physical Review. D, Particles Fields Journal Issue: 9 Vol. 75; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BARYONS
BCS THEORY
BOSE-EINSTEIN CONDENSATION
CHARGE DENSITY
CHIRAL SYMMETRY
COLOR MODEL
GROUND STATES
ISOSPIN
PION CONDENSATION
POTENTIALS
QUANTUM CHROMODYNAMICS
QUARKS
SUPERCONDUCTORS
VECTOR MESONS