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

Abstract

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.

Authors:
; ;  [1]
  1. Physics Department, Tsinghua University, Beijing 100084 (China)
Publication Date:
OSTI Identifier:
21020517
Resource Type:
Journal Article
Resource Relation:
Journal Name: Physical Review. D, Particles Fields; Journal Volume: 75; Journal Issue: 9; Other Information: DOI: 10.1103/PhysRevD.75.096004; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
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

Citation Formats

Sun Gaofeng, He Lianyi, and Zhuang Pengfei. BEC-BCS crossover in the Nambu-Jona-Lasinio model of QCD. United States: N. p., 2007. Web. doi:10.1103/PHYSREVD.75.096004.
Sun Gaofeng, He Lianyi, & Zhuang Pengfei. BEC-BCS crossover in the Nambu-Jona-Lasinio model of QCD. United States. doi:10.1103/PHYSREVD.75.096004.
Sun Gaofeng, He Lianyi, and Zhuang Pengfei. Tue . "BEC-BCS crossover in the Nambu-Jona-Lasinio model of QCD". United States. doi:10.1103/PHYSREVD.75.096004.
@article{osti_21020517,
title = {BEC-BCS crossover in the Nambu-Jona-Lasinio model of QCD},
author = {Sun Gaofeng and He Lianyi and Zhuang Pengfei},
abstractNote = {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.},
doi = {10.1103/PHYSREVD.75.096004},
journal = {Physical Review. D, Particles Fields},
number = 9,
volume = 75,
place = {United States},
year = {Tue May 01 00:00:00 EDT 2007},
month = {Tue May 01 00:00:00 EDT 2007}
}