3+1 dimensional viscous hydrodynamics at high baryon densities

Hot Quarks 2014: Workshop for young scientists on the physics of ultrarelativistic nucleus-nucleus collisions

Karpenko, Iu.^1,2 ; Bleicher, M.^1,3 ; Huovinen, P.^1,3 ; Petersen, H.^1,3

Frankfurt Institute for Advanced Studies, Ruth-Moufang-Straße 1, Frankfurt am Main

60438, Germany^1

Bogolyubov Institute for Theoretical Physics, 14-b, Metrolohichna str., Kiev

03680, Ukraine^2

Institute for Theoretical Physics, Johann Wolfgang Goethe Universität, Max-von-Laue-Str. 1, Frankfurt am Main

60438, Germany^3

关键词: Baryon density;    CASCADE model;    Collision energies;    Entropy density;    Equation of state;    Heavy ion collision;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/612/1/012052/pdf
DOI  :  10.1088/1742-6596/612/1/012052

来源: IOP

【 摘 要 】

A 3+1 dimensional event-by-event viscous hydrodynamic + cascade model is applied for the simulation of heavy ion collision reactions at √sNN= 6.3200 GeV. UrQMD cascade is used for the pre-thermal (pre-hydro) and final (post-hydro) stages of the reaction. The baryon, as well as electric charge densities are consistently taken into account in the model. For this aim the equation of state based on a Chiral model coupled to the Polyakov loop is used in hydrodynamic phase of evolution. As a result of the model adjustment to the experimental data, the effective values of the shear viscosity over entropy density η/s are obtained for different collision energies in the BES region. A decrease of the effective values of η/s from 0.2 to 0.08 is observed as collision energy increases from √s ≈ 7 to 39 GeV.