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Effective kinetic description of event-by-event pre-equilibrium dynamics in high-energy heavy-ion collisions
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 n...
Autores principales: | , , , , |
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Lenguaje: | eng |
Publicado: |
2018
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Materias: | |
Acceso en línea: | https://dx.doi.org/10.1103/PhysRevC.99.034910 http://cds.cern.ch/record/2319085 |
_version_ | 1780958403898638336 |
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author | Kurkela, Aleksi Mazeliauskas, Aleksas Paquet, Jean-François Schlichting, Sören Teaney, Derek |
author_facet | Kurkela, Aleksi Mazeliauskas, Aleksas Paquet, Jean-François Schlichting, Sören Teaney, Derek |
author_sort | Kurkela, Aleksi |
collection | CERN |
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 (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 τhydro when the system is well described by relativistic viscous hydrodynamics. The subsequent hydrodynamic evolution becomes essentially independent of the hydrodynamic initialization time τhydro as long as τhydro is chosen in an appropriate range where both kinetic and hydrodynamic descriptions overlap. We find that for sNN=2.76TeV central Pb-Pb collisions, the typical timescale when viscous hydrodynamics with shear viscosity over entropy ratio η/s=0.16 becomes applicable is τhydro∼1fm/c after the collision. |
id | cern-2319085 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2018 |
record_format | invenio |
spelling | cern-23190852021-02-27T04:01:24Zdoi:10.1103/PhysRevC.99.034910http://cds.cern.ch/record/2319085engKurkela, AleksiMazeliauskas, AleksasPaquet, Jean-FrançoisSchlichting, SörenTeaney, DerekEffective kinetic description of event-by-event pre-equilibrium dynamics in high-energy heavy-ion collisionsnucl-thNuclear Physics - Theoryhep-phParticle Physics - PhenomenologyWe 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 τhydro when the system is well described by relativistic viscous hydrodynamics. The subsequent hydrodynamic evolution becomes essentially independent of the hydrodynamic initialization time τhydro as long as τhydro is chosen in an appropriate range where both kinetic and hydrodynamic descriptions overlap. We find that for sNN=2.76TeV central Pb-Pb collisions, the typical timescale when viscous hydrodynamics with shear viscosity over entropy ratio η/s=0.16 becomes applicable is τhydro∼1fm/c after the collision.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.arXiv:1805.00961oai:cds.cern.ch:23190852018-05-02 |
spellingShingle | nucl-th Nuclear Physics - Theory hep-ph Particle Physics - Phenomenology Kurkela, Aleksi Mazeliauskas, Aleksas Paquet, Jean-François Schlichting, Sören Teaney, Derek Effective kinetic description of event-by-event pre-equilibrium dynamics in high-energy heavy-ion collisions |
title | Effective kinetic description of event-by-event pre-equilibrium dynamics in high-energy heavy-ion collisions |
title_full | Effective kinetic description of event-by-event pre-equilibrium dynamics in high-energy heavy-ion collisions |
title_fullStr | Effective kinetic description of event-by-event pre-equilibrium dynamics in high-energy heavy-ion collisions |
title_full_unstemmed | Effective kinetic description of event-by-event pre-equilibrium dynamics in high-energy heavy-ion collisions |
title_short | Effective kinetic description of event-by-event pre-equilibrium dynamics in high-energy heavy-ion collisions |
title_sort | effective kinetic description of event-by-event pre-equilibrium dynamics in high-energy heavy-ion collisions |
topic | nucl-th Nuclear Physics - Theory hep-ph Particle Physics - Phenomenology |
url | https://dx.doi.org/10.1103/PhysRevC.99.034910 http://cds.cern.ch/record/2319085 |
work_keys_str_mv | AT kurkelaaleksi effectivekineticdescriptionofeventbyeventpreequilibriumdynamicsinhighenergyheavyioncollisions AT mazeliauskasaleksas effectivekineticdescriptionofeventbyeventpreequilibriumdynamicsinhighenergyheavyioncollisions AT paquetjeanfrancois effectivekineticdescriptionofeventbyeventpreequilibriumdynamicsinhighenergyheavyioncollisions AT schlichtingsoren effectivekineticdescriptionofeventbyeventpreequilibriumdynamicsinhighenergyheavyioncollisions AT teaneyderek effectivekineticdescriptionofeventbyeventpreequilibriumdynamicsinhighenergyheavyioncollisions |