Impact of nonequilibrium initial conditions with a saturation scale on elliptic flow in heavy ion collisions

We have studied by means of kinetic theory based on a relativistic Boltzmann-like transport simulation the impact of the out-of-equilibrium initial distribution proper of a Color Glass Condensate into the build-up the elliptic flow. Our main result is that the available data on v(2) are in agreement with a eta/s approximate to 1/4 pi also for Color Glass Condensate initial conditions. We have found that the impact of the nonequilibrium implied by the saturation scale can modify the estimate of the viscosity respect to the assumption of full thermalization in P-T-space. In particular we have observed that the estimate of eta/s is modified from eta/s approximate to 2/4 pi to eta/s approximate to 1/4 pi at RHIC and from eta/s approximate to 3/4 pi to eta/s approximate to 2/4 pi at LHC (c) 2014 Elsevier B.V. All rights reserved.