Initial conditions for hydrodynamics from weakly coupled pre-equilibrium evolution
Liam Keegan (Theoretical Physics Department, CERN, CH-1211, Geneva, Switzerland); Aleksi Kurkela (Faculty of Science and Technology, University of Stavanger, 4036, Stavanger, Norway, Theoretical Physics Department, CERN, CH-1211, Geneva, Switzerland); Aleksas Mazeliauskas (Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York, 11794, USA); Derek Teaney (Department of Physics and Astronomy, Stony Brook University, Stony Brook, New York, 11794, USA)
We use effective kinetic theory, accurate at weak coupling, to simulate the preequilibrium evolution of transverse energy and flow perturbations in heavy-ion collisions. We provide a Green function which propagates the initial perturbations to the energymomentum tensor at a time when hydrodynamics becomes applicable. With this map, the complete pre-thermal evolution from saturated nuclei to hydrodynamics can be modelled in a perturbatively controlled way.
