# Quark Matter 2012

12-18 August 2012
US/Eastern timezone

## Dissipative effects in multi-component systems

17 Aug 2012, 17:10
20m
Empire

### Empire

Oral Presentation New theoretical developments

### Speaker

Andrej El (University of Frankfurt)

### Description

We demonstrate that the shear viscosity of a two-component mixture of point-like partices has a non-trivial time dependence, which is induced by the intrinsic coupling between the two particle species. The shear viscosity coefficient of a mixture calculated using the Green-Kubo relation does not have this time dependence and hence is not sufficient to describe dissipatie hydrodynamic behavior of a mixture. In particular this means, that the shear viscosity to entropy density values of a QGP or a hadron gas obtained from comparisons of elliptic flow $v_2$ calculated in standard one-component hydrodynamic with measurements done at RHIC and LHC must also contain a time-dependence characterisitc for the mixture, which so far has never been taken into account. The results we present here are obtained using the kinetic transport model BAMPS as well as dissipative hydrodynamic calculations in 2+1 Dimensions.

### Primary author

Andrej El (University of Frankfurt)

### Co-authors

Carsten Greiner (University of Frankfurt) Ioannis Bouras (University of Frankfurt a.M.)

 Slides