Effective kinetic description of event-by-event pre-equilibrium dynamics in high-energy heavy-ion collisions

Kurkela, Aleksi; Mazeliauskas, Aleksas; Paquet, Jean-François; Schlichting, Sören; Teaney, Derek

doi:10.1103/PhysRevC.99.034910

Title: Effective kinetic description of event-by-event pre-equilibrium dynamics in high-energy heavy-ion collisions

Journal Article · Wed Mar 27 00:00:00 EDT 2019 · Physical Review. C

DOI:https://doi.org/10.1103/PhysRevC.99.034910· OSTI ID:1503381

Kurkela, Aleksi; Mazeliauskas, Aleksas; Paquet, Jean-François; Schlichting, Sören; Teaney, Derek

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 (à la “bottom-up”), we calculate the nonequilibrium evolution of the local background energy-momentum tensor as well as the nonequilibrium 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 to the time τ hydro when the system is well described by relativistic viscous hydrodynamics. The subsequent hydrodynamic evolution becomes essentially independent of the hydrodynamic initialization time τ_hydro as long as τ_hydro is chosen in an appropriate range where both kinetic and hydrodynamic descriptions overlap. We find that for √^sNN = 2.76 TeV central Pb-Pb collisions, the typical timescale when viscous hydrodynamics with shear viscosity over entropy ratio η/s = 0.16 becomes applicable is τ_hydro ~1 fm /c after the collision.

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Research Organization:: Duke Univ., Durham, NC (United States); State Univ. of New York (SUNY), Albany, NY (United States); Univ. of Washington, Seattle, WA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Nuclear Physics (NP)

Grant/Contract Number:: FG02-88ER40388; FG02-05ER41367; FG02-97ER41014

OSTI ID:: 1503381

Alternate ID(s):: OSTI ID: 1609636

Journal Information:: Physical Review. C, Journal Name: Physical Review. C Vol. 99 Journal Issue: 3; ISSN 2469-9985

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 83 works

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