Chiral phases of QCD at finite density and temperature

A. Barducci, R. Casalbuoni, G. Pettini, and R. Gatto
Phys. Rev. D 49, 426 – Published 1 January 1994
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Abstract

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.

  • Received 29 June 1993

DOI:https://doi.org/10.1103/PhysRevD.49.426

©1994 American Physical Society

Authors & Affiliations

A. Barducci, R. Casalbuoni, and G. Pettini

  • Dipartimento di Fisica, Università di Firenze, I-50125 Firenze, Italy
  • Istituto Nazionale di Fisica Nucleare, Sezione di Firenze, I-50125 Firenze, Italy

R. Gatto

  • Département de Physique Théorique, Université de Génève, CH-1211 Génève 4, Switzerland

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Vol. 49, Iss. 1 — 1 January 1994

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