Coherent amplification of classical pion fields during the cooling of droplets of quark plasma

Journal Article · Sun Jun 01 04:00:00 EDT 1997 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.55.6887· OSTI ID:503793

Abada, A; Birse, M C ^[1]

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1. Theoretical Physics Group, Department of Physics and Astronomy, University of Manchester, Manchester M13 9PL (England)

In the framework of the linear {sigma} model, we study the time evolution of a system of classical {sigma} and pion fields coupled to quarks. For this purpose we solve numerically the classical transport equation for relativistic quarks coupled to the nonlinear Klein-Gordon equations for the meson fields. We examine evolution starting from variety of initial conditions corresponding to spherical droplets of hot quark matter, which might mimic the behavior of a quark plasma produced in high-energy nucleus-nucleus collisions. For large droplets we find a strong amplification of the pion field that oscillates in time. This leads to a coherent production of pions with a particular isospin and so would have similar observable effects to a disoriented chiral condensate which various authors have suggested might be a signal of the chiral phase transition. The mechanism for amplification of the pion field found here does not rely on this phase transition and is better thought of as a {open_quotes}pion laser{close_quotes} which is driven by large oscillations of the {sigma} field. {copyright} {ital 1997} {ital The American Physical Society}

• OSTI ID: 503793
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 11 Vol. 55; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
AMPLIFICATION
CHIRAL SYMMETRY
CONDENSATES
COOLING
DROPLETS
HEAVY ION REACTIONS
ISOSPIN
KLEIN-GORDON EQUATION
PHASE TRANSFORMATIONS
PIONS
PLASMA
QUANTUM CHROMODYNAMICS
QUARK MATTER
SIGMA MODEL