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      Evolution of Hot, Dissipative Quark Matter in Relativistic Nuclear Collisions

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          Abstract

          Non-ideal fluid dynamics with cylindrical symmetry in transverse direction and longitudinal scaling flow is employed to simulate the space-time evolution of the quark-gluon plasma produced in heavy-ion collisions at RHIC energies. The dynamical expansion is studied as a function of initial energy density and initial time. A causal theory of dissipative fluid dynamics is used instead of the standard theories which are acausal. We compute the parton momentum spectra and HBT radii from two-particle correlation functions. We find that, in non-ideal fluid dynamics, the reduction of the longitudinal pressure due to viscous effects leads to an increase of transverse flow and a decrease of the ratio \(R_{out}/R_{side}\) as compared to the ideal fluid approximation.

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          On the kinetic theory of rarefied gases

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            Single-particle distribution in the hydrodynamic and statistical thermodynamic models of multiparticle production

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              Pion Interferometry at RHIC: Probing a thermalized Quark-Gluon-Plasma?

              We calculate the Gaussian radius parameters of the pion-emitting source in high energy heavy ion collisions, assuming a first order phase transition from a thermalized Quark-Gluon-Plasma (QGP) to a gas of hadrons. Such a model leads to a very long-lived dissipative hadronic rescattering phase which dominates the properties of the two-pion correlation functions. The radii are found to depend only weakly on the thermalization time tau_i, the critical temperature T_c (and thus the latent heat), and the specific entropy of the QGP. The dissipative hadronic stage enforces large variations of the pion emission times around the mean. Therefore, the model calculations suggest a rapid increase of R_out/R_side as a function of K_T if a thermalized QGP were formed.
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                Author and article information

                Journal
                30 July 2004
                2004-12-05
                Article
                nucl-th/0407114
                d3e6e893-207e-4fcb-bfea-485faef83c07
                History
                Custom metadata
                25 pages, 5 figures, corrected typos and and minor changes
                nucl-th hep-ph

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