Coherent amplification of classical pion fields during the cooling of droplets of quark plasma
- 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, Vol. 55, Issue 11; Other Information: PBD: Jun 1997
- Country of Publication:
- United States
- Language:
- English
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