Mainz 2022 – scientific programme
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HK: Fachverband Physik der Hadronen und Kerne
HK 65: Heavy-Ion Collisions and QCD Phases XIII
HK 65.1: Talk
Thursday, March 31, 2022, 16:00–16:15, HK-H1
Temperature and net baryochemical potential dependence of η/s in a hybrid approach — •Niklas Götz1,2 and Hannah Elfner3,1,2 — 1Institute for Theoretical Physics, Goethe University, Max-von-Laue-Strasse 1, 60438 Frankfurt am Main, Germany — 2Frankfurt Institute for Advanced Studies, Ruth-Moufang-Strasse 1, 60438 Frankfurt am Main, Germany — 3GSI Helmholtzzentrum für Schwerionenforschung, Planckstr. 1, 64291 Darmstadt, Germany
In this work, the qualitative impact of the net baryochemical potential dependence of the shear viscosity to entropy density ratio η/s in hydrodynamical simulations is studied. The effect of a predicted non-constant η/s(µB) is largely unexplored in hydrodynamic simulations. Previous studies focus only on a temperature dependence or even only a constant effective shear viscosity. This work addresses this issue by studying qualitatively the effect of a generalized η/s(T,µB) in the novel hybrid approach SMASH-vHLLE, composed of the hadronic transport approach SMASH1 and the (3+1)d viscous hydrodynamic code vHLLE2. In order to reduce the bias of the result on the equation of state used in the hydrodynamic part of the model, η/s is parameterized directly in the energy density and baryon number density. This work compares the impact of the density dependence for different system sizes and energies and constrains the behaviour of η/s(T,µB) by ruling out regions of the parameter space.
[1] https://github.com/smash-transport/smash
[2] https://github.com/yukarpenko/vhlle