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Titolo:
Color superconductivity and chiral symmetry restoration at non-zero baryondensity and temperature
Autore:
Berges, J; Rajagopal, K;
Indirizzi:
MIT, Ctr Theoret Phys, Nucl Sci Lab, Cambridge, MA 02139 USA MIT Cambridge MA USA 02139 et Phys, Nucl Sci Lab, Cambridge, MA 02139 USA MIT, Dept Phys, Cambridge, MA 02139 USA MIT Cambridge MA USA 02139MIT, Dept Phys, Cambridge, MA 02139 USA
Titolo Testata:
NUCLEAR PHYSICS B
fascicolo: 1-2, volume: 538, anno: 1999,
pagine: 215 - 232
SICI:
0550-3213(19990111)538:1-2<215:CSACSR>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
JONA-LASINIO MODEL; FINITE-TEMPERATURE; PHASE-TRANSITION; MATTER; NAMBU; QCD; CHROMODYNAMICS; EQUATION; STATE;
Keywords:
finite temperature/density QCD; tricritical point; diquark; effective potential;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
34
Recensione:
Indirizzi per estratti:
Indirizzo: Berges, J MIT, Ctr Theoret Phys, Nucl Sci Lab, Cambridge, MA 02139 USA MIT Cambridge MA USA 02139 ucl Sci Lab, Cambridge, MA 02139 USA
Citazione:
J. Berges e K. Rajagopal, "Color superconductivity and chiral symmetry restoration at non-zero baryondensity and temperature", NUCL PHYS B, 538(1-2), 1999, pp. 215-232

Abstract

We explore the phase diagram of strongly interacting matter as a function of temperature and baryon number density, using a class of models for two-flavor QCD in which the interaction between quarks is modelled by that induced by instantons. Our treatment allows us to investigate the possible simultaneous formation of condensates in the conventional quark-anti-quark channel (breaking chiral symmetry) and in a quark-quark channel leading to colorsuperconductivity: the spontaneous breaking of color symmetry via the formation of quark Cooper pairs. At low temperatures, chiral symmetry restoration occurs via a first-order transition between a phase with low (or zero) baryon density and a high density color superconducting phase. We find colorsuperconductivity in the high density phase for temperatures less than of order tens to 100 MeV, and find coexisting [qq] and [(q) over bar q] condensates in this phase in the presence of a current quark mass, At high temperatures, the chiral phase transition is second order in the chiral limit andis a smooth crossover for non-zero current quark mass. A tricritical pointseparates the first-order transition at high densities from the second-order transition at high temperatures. In the presence of a current quark massthis tricritical point becomes a second-order phase transition with Ising model exponents, suggesting that a long correlation length may develop in heavy ion collisions in which the phase transition is traversed at the appropriate density, (C) 1999 Elsevier Science B.V.

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Documento generato il 09/07/20 alle ore 14:00:20