Probes for the early reaction dynamics of heavy-ion collisions at AGS and SPS

Details Probes for the early reaction dynamics of heavy-ion collisions at AGS and SPS Probes for the early reaction dynamics of heavy-ion collisions at AGS and SPS

1997-05-30

arxiv.org/abs/nucl-th/9705056v1

Heavy Ion Physics 5 (1997) 357

Physics

Nuclear Physics

Nuclear Theory

Proceedings of the workshop on hydrodynamics at ECT*, May 12-17 (1997); to be published in Heavy-Ion Phys

Scientific paper

We discuss the early evolution of ultrarelativistic heavy-ion collisions within a multi-fluid dynamical model. In particular, we show that due to the finite mean-free path of the particles compression shock waves are smeared out considerably as compared to the one-fluid limit. Also, the maximal energy density of the baryons is much lower. We discuss the time scale of kinetic equilibration of the baryons in the central region and its relevance for directed flow. Finally, thermal emission of direct photons from the fluid of produced particles is calculated within the three-fluid model and two other simple expansion models. It is shown that the transverse momentum and rapidity spectra of photons give clue to the cooling law and the early rapidity distribution of the photon source.

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