Hydrodynamic Attractors, Initial State Energy, and Particle Production in Relativistic Nuclear Collisions
Giuliano Giacalone (Institut de Physique Théorique, Université Paris Saclay, CNRS, CEA, F-91191 Gif-sur-Yvette, France); Aleksas Mazeliauskas (Theoretical Physics Department, CERN, CH-1211 Genève 23, Switzerland and Institut für Theoretische Physik, Universität Heidelberg, Philosophenweg 16, D-69120 Heidelberg, Germany); Sören Schlichting (Fakultät für Physik, Universität Bielefeld, D-33615 Bielefeld, Germany)
We exploit the concept of hydrodynamic attractors to establish a macroscopic description of the early time out-of-equilibrium dynamics of high energy heavy-ion collisions. One direct consequence is a general relation between the initial state energy and the produced particle multiplicities measured in experiments. When combined with an ab initio model of energy deposition, the entropy production during the preequilibrium phase naturally explains the universal centrality dependence of the measured charged particle yields in nucleus-nucleus collisions. Further, we estimate the energy density of the far-from-equilibrium initial state and discuss how our results can be used to constrain nonequilibrium properties of the quark-gluon plasma.
