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

被引:26
作者
Abada, A
Birse, MC
机构
[1] Theoretical Physics Group, Department of Physics and Astronomy, University of Manchester, Manchester
关键词
D O I
10.1103/PhysRevD.55.6887
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
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 ''pion laser'' which is driven by large oscillations of the sigma field.
引用
收藏
页码:6887 / 6899
页数:13
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