Chiral phases of QCD at finite density and temperature

Journal Article · Sat Jan 01 00:00:00 EST 1994 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.49.426· OSTI ID:5409687

Barducci, A; Casalbuoni, R; Pettini, G ^[1]; Gatto, R ^[2]

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1. Dipartimento di Fisica, Universita di Firenze, I-50125 Firenze (Italy) Istituto Nazionale di Fisica Nucleare, Sezione di Firenze, I-50125 Firenze (Italy)
2. Departement de Physique Theorique, Universite de Geneve, CH-1211 Geneve 4 (Switzerland)

Chiral transitions in QCD at finite temperature and density are discussed within a composite operator formalism. For massless quarks the phase diagram in temperature and chemical potentials presents a tricritical point at the intersection of the critical line for first-order phase transitions and second-order transitions. The overall picture is not sensibly affected by small quark masses, except that the quark condensate no longer vanishes for large temperatures and/or chemical potentials, and for first-order transitions it remains discontinuous only for small quark mass values. Such effects are discussed by Clausius-Clapeyron-like relations. The Landau expansion is used around the tricritical point and for second-order transitions.

• OSTI ID: 5409687
• Journal Information: Physical Review, D (Particles Fields); (United States), Vol. 49:1; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
CHIRAL SYMMETRY
PHASE TRANSFORMATIONS
QUANTUM CHROMODYNAMICS
CONDENSATES
DENSITY
MASS
QUARKS
TEMPERATURE DEPENDENCE
ELEMENTARY PARTICLES
FERMIONS
FIELD THEORIES
PHYSICAL PROPERTIES
POSTULATED PARTICLES
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