``Pressure Equilibration'' in Ultrarelativistic Heavy Ion Collisions
J. Brachmann, A. Dumitru, C. Spieles, J. Maruhn, H. Stöcker, W. Greiner
Abstract
We study the time scale for pressure equilibration in heavy ion collisions at AGS energies within the three-fluid hydrodynamical model and a microscopic cascade model (UrQMD). We find that kinetic equilibrium is reached in both models after a time of 5 fm/c (center-of-mass time). Thus, observables which are sensitive to the early stage of the reaction differ considerably from the expectations within the instant thermalization scenario (one-fluid hydrodynamical model).
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