Effective dynamical coupling of hydrodynamics and transport for heavy-ion collisions

Workshop for young scientists on the physics of ultrarelativistic nucleus-nucleus collisions 2016

Oliinychenko, Dmytro^1,4 ; Petersen, Hannah^1,2,3

Frankfurt Institute for Advanced Studies, Ruth-Moufang-Straße 1, Frankfurt am Main

D-60438, Germany^1

Institut für Theoretische Physik, Goethe-Universität, Frankfurt am Main

D-60438, Germany^2

GSI Helmholtzzentrum für Schwerionenforschung GmbH, Planckstr. 1, Darmstadt

64291, Germany^3

Bogolyubov Institute for Theoretical Physics, Kiev

03680, Ukraine^4

关键词: Collision energies;    Conventional transports;    Dynamical coupling;    Event simulation;    Heavy ion collision;    High energy densities;    Thermalization;    Transverse momenta;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/832/1/012052/pdf
DOI  :  10.1088/1742-6596/832/1/012052

来源: IOP

【 摘 要 】

Present hydrodynamics-based simulations of heavy-ion collisions neglect the feedback from the frozen-out particles flying back into the hydrodynamical region. This causes an artefact called "negative Cooper-Frye contributions", which is negligible for high collision energies, but becomes significant for lower RHIC BES energies and for event-by-event simulations. To avoid negative Cooper-Frye contributions, while still preserving hydrodynamical behavior, we propose a pure hadronic transport approach with forced thermalization in the regions of high energy density. It is demonstrated that this approach exhibits enhancement of strangeness and mean transverse momenta compared to conventional transport - an effect typical for hydrodynamical approaches.