Color neutrality effects in the phase diagram of the Polyakov--Nambu--Jona-Lasinio model

Journal Article · Mon Dec 01 00:00:00 EST 2008 · Physical Review. D, Particles Fields

DOI:https://doi.org/10.1103/PHYSREVD.78.114021· OSTI ID:21251009

Dumm, D Gomez ^[1]; Blaschke, D B ^[2]; Grunfeld, A G ^[3]; Scoccola, N N ^[3]

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1. IFLP, CONICET - Departmento de Fisica, Universidad Nacional de La Plata, C.C. 67, 1900 La Plata (Argentina)
2. Institute for Theoretical Physics, University of Wroclaw, Max Born Place 9, 50204 Wroclaw (Poland)
3. CONICET, Rivadavia 1917, 1033 Buenos Aires (Argentina)

The phase diagram of a two-flavor Polyakov-loop Nambu-Jona-Lasinio model is analyzed imposing the constraint of color charge neutrality. The main effect of this constraint is a coexistence of the chiral symmetry breaking ({chi}SB) and two-flavor superconducting phases. Additional effects are a shrinking of the {chi}SB domain in the T-{mu} plane and a shift of the end point to lower temperatures, but their quantitative importance is shadowed by the intrinsic uncertainties of the model. The effects can be understood in view of the presence of a nonvanishing color chemical potential {mu}{sub 8}, which is introduced to compensate the color charge density {rho}{sub 8} induced by a background color gauge mean field {phi}{sub 3}. At low temperatures and large chemical potentials the model exhibits a quarkyonic phase, which gets additional support from the diquark condensation.

• OSTI ID: 21251009
• Journal Information: Physical Review. D, Particles Fields, Vol. 78, Issue 11; Other Information: DOI: 10.1103/PhysRevD.78.114021; (c) 2008 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHARGE DENSITY
CHIRAL SYMMETRY
COLOR MODEL
FLAVOR MODEL
MEAN-FIELD THEORY
PHASE DIAGRAMS
POTENTIALS
SIMULATION
SYMMETRY BREAKING