Can disoriented chiral condensates form A dynamical perspective

Journal Article · Sat Jan 14 23:00:00 EST 1995 · Physical Review, D (Particles Fields); (United States)

DOI:https://doi.org/10.1103/PhysRevD.51.734· OSTI ID:6644274

Boyanovsky, D ^[1]; de Vega, H J ^[2]; Holman, R ^[3]

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1. Department of Physics and Astronomy, University of Pittsburgh, Pittsburgh, Pennsylvania 15260 (United States)
2. Laboratoire de Physique Theorique et Hautes Energies, Universite Pierre et Marie Curie (Paris VI), Tour 16, 1er. etage, 4, Place Jussieu 75252 Paris, Cedex 05 (France)
3. Department of Physics, Carnegie Mellon University, Pittsburgh, Pennsylvania 15213 (United States)

We address the issue of whether a region of disoriented chiral condensate (DCC), in which the chiral condensate has components along the pion directions, can form. We consider a system going through the chiral phase transition via a quench, in which relaxation of the high temperature phase to the low temperature one occurs rapidly (within a time scale of order [similar to]1 fm/[ital c]). We use a density matrix based formalism that takes both thermal and quantum fluctuations into account nonperturbatively to argue that if the O(4) linear [sigma] model is the correct way to model the situation in QCD, then it is very unlikely, at least in the Hartree approximation, that a large ([gt]10 fm) DCC region will form. Typical sizes of such regions are [similar to]1--2 fm and the density of pions in such regions is at most of order [similar to]0.2/fm[sup 3]. We end with some speculations on how large DCC regions may be formed.

• OSTI ID: 6644274
• Journal Information: Physical Review, D (Particles Fields); (United States), Journal Name: Physical Review, D (Particles Fields); (United States) Vol. 51:2; ISSN 0556-2821; ISSN PRVDAQ
• Country of Publication: United States
• Language: English

Related Subjects

662110 -- General Theory of Particles & Fields-- Theory of Fields & Strings-- (1992-)
662120* -- General Theory of Particles & Fields-- Symmetry
Conservation Laws
Currents & Their Properties-- (1992-)
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BOSON-EXCHANGE MODELS
BOSONS
CHIRAL SYMMETRY
CONDENSATES
DENSITY MATRIX
DYNAMICAL GROUPS
ELEMENTARY PARTICLES
FIELD THEORIES
FLUCTUATIONS
HADRONS
LIE GROUPS
MATHEMATICAL MODELS
MATRICES
MESONS
O GROUPS
PARTICLE MODELS
PERIPHERAL MODELS
PHASE TRANSFORMATIONS
PIONS
PSEUDOSCALAR MESONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
SIGMA MODEL
SYMMETRY
SYMMETRY GROUPS
VARIATIONS