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HK: Fachverband Physik der Hadronen und Kerne

HK 34: Postersitzung

HK 34.66: Poster

Donnerstag, 13. März 2008, 14:00–16:00, Poster C3

Thermalization beyond the Bottom-Up Picture — •Andrej El^1,2, Carsten Greiner^1,3, and Zhe Xu^1,4 — ¹Insitut für Theoretische Physik, Johann Wolfgang Goethe-Universität, 60054 Frankfurt am Main — ²el@th.physik.uni-frankfurt.de — ³Carsten.Greiner@th.physik.uni-frankfurt.de — ⁴xu@th.physik.uni-frankfurt.de

Starting with the initial condition of a Color Glass Condensate we investigate thermalization of a QGP in expanding 1+1 Bjorken geometry, with inelastic gg<->ggg collisions with pQCD calculated crossections included. Our main focus lies on comparison of thermalization process with the Bottom-Up scenario. We observe a mismatch with the Bottom-Up picture, since no significant increase of particle number due to production of soft particles during early evolution of the system can be observed. Thermalization occurs over the whole range of transversal momenta on approximately equal timescales t~1fm/c. Early themalization is observed in simulations with LHC relevant parameters: after approximately 0.75 fm/c the system exhibits quasi-hydrodynamical behavior. Shear viscosity and ratio to entropy density are calculated applying standard dissipative hydrodynamics in Bjorken geometry. The calculated ratio viscosity to entropy density lies close to the AdS/CFT limit.