NONLINEAR
PHENOMENA IN COMPLEX SYSTEMS
An Interdisciplinary Journal
2009, Vol.12, No.4, pp.496-502
Non-Equilibrium Approaches to the Pre-Thermal and
Post-Hadronisation Stages of A+A
Collisions.
Yu. M. Sinyukov and Iu. A. Karpenko
The results related to non-equilibrium phenomena at the very early
and late stages of the processes of A+A collisions are presented. A
good description of the hadron momentum spectra as well as pion and
kaon interferometry data at RHIC is reached within the realistic
dynamical picture of A+A collisions: HydroKinetic Model (HKM). The
model accumulates the following features: not too early
thermalization time; 
fm/c; a developing of the
pre-thermal transverse flows; the effectively more hard, than in the
case of chemical equilibrium, equation of state of expanding
chemically non-equilibrated multi-hadronic gas; a continuous
non-equilibrated emission of hadrons. All these factors lead to a
good description of the mentioned RHIC data, in particular, the
observed Rout/Rside ratios, solving, therefore, the HBT
puzzle in detailed realistic model.
Key words:
heavy ion collisions, momentum spectra, HBT radii,
hydrodynamics, kinetics
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Last updated: February 15, 2010