Speakers
Dr
Aleksas Mazeliauskas
(Institut für Theoretische Physik, Universität Heidelberg)
Dr
Soeren Schlichting
(University of Washington)
Description
We develop a macroscopic description of the space-time evolution of the energy-momentum tensor during the pre-equilibrium stage of a high-energy heavy-ion collision. Based on a weak coupling effective kinetic description of the microscopic equilibration process (\`a la ``bottom-up"), we calculate the non-equilibrium evolution of the local background energy-momentum tensor as well as the non-equilibrium linear response to transverse energy and momentum perturbations for realistic boost-invariant initial conditions for heavy ion collisions. We demonstrate how this framework can be used on an event-by-event basis to propagate the energy momentum tensor from far-from-equilibrium initial state models, e.g.\ IP-Glasma, to the time $\tau_\text{hydro}$ when the system is well described by relativistic viscous hydrodynamics. The subsequent hydrodynamic evolution becomes essentially independent of the hydrodynamic initialization time $\tau_\text{hydro}$ as long as $\tau_\text{hydro}$ is chosen in an appropriate range where both kinetic and hydrodynamic descriptions overlap. We find that for $\sqrt{s_{NN}}=2.76\,\text{TeV}$ central Pb-Pb collisions, the typical time scale when viscous hydrodynamics with shear viscosity over entropy ratio $\eta/s=0.16$ becomes applicable is $\tau_\text{hydro}\sim 1\,\text{fm/c}$ after the collision.
Primary author
Dr
Aleksas Mazeliauskas
(Institut für Theoretische Physik, Universität Heidelberg)
Co-authors
Prof.
Aleksi Kurkela
(Theoretical Physics Department, CERN, Switzerland and Faculty of Science and Technology, University of Stavanger, Norway)
Prof.
Derek Teaney
(Stony Brook University, USA)
Dr
Jean-François Paquet
(Department of Physics, Duke University, USA)
Dr
Soeren Schlichting
(University of Washington)