https://doi.org/10.1051/epjconf/20146604009
Anisotropic Flow from Non-equilibrium Initial Condition with a Saturation Scale
1 Department of Physics and Astronomy, University of Catania, Via S. Sofia 64, I-95125 Catania, Italy
2 Laboratorio Nazionale del Sud, INFN-LNS, Via S. Sofia 63, I-95125 Catania, Italy
a e-mail: greco@lns.infn.it
Published online: 20 March 2014
A current goal of relativistic heavy ion collisions experiments is to understand the impact of initial non-equilibrium on final observables. A Color Glass Condensate (CGC) as the limiting state of QCD matter at very high density implies initial non-thermal distribution at least for momenta below the saturation scale. In viscous hydrodynamics simulations, a standard Glauber initial condition leads to estimate 4πη/s ~ 1, while employing the Kharzeev-Levin-Nardi (KLN) modeling of the CGC leads to at least a factor of 2 larger η/s. Within a kinetic theory approach based on a relativistic Boltzmann-like transport simulation, our main result is that the out-of-equilibrium initial distribution in p-space reduces the effciency in building-up the elliptic flow. At RHIC energy we find the available data on υ2 are in agreement with a 4πη/s ~ 1 also for KLN initial conditions.
© Owned by the authors, published by EDP Sciences, 2014
This is an Open Access article distributed under the terms of the Creative Commons Attribution License 2.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
