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``Pressure Equilibration'' in Ultrarelativistic Heavy Ion Collisions

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arxiv nucl-th/9701045 v1 pith:NB3RIPDR submitted 1997-01-22 nucl-th

``Pressure Equilibration'' in Ultrarelativistic Heavy Ion Collisions

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keywords modeltimecollisionsequilibrationheavyhydrodynamicalpressurecascade
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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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