Seminar in Hadronic Physics

Temperature dependence of eta/s: Elusive goal just around the corner

Pasi Huovinen

Institut für Theoretische Physik
Johann Wolfgang Goethe Universität

It is known that extracting the temperature dependence of the shear viscosity coefficient over entropy density ratio of partonic matter from experimental data is very difficult, maybe even impossible. In this talk I will discuss how we can get information about the temperature dependence from the data, and show that parametrizations of (eta/s)(T) which lead to identical v₂(p_T) at one centrality can be distinguished when one evaluates the anisotropies as function of collision energy, centrality and rapidity. I will further discuss how the use of freeze-out based on Knudsen number affects the fluid dynamical results.