Hydrodynamic attractor of a hybrid viscous fluid in Bjorken flow

The nonequilibrium evolution in a boost-invariant Bjorken flow of a hybrid viscous fluid model containing two interacting components with different viscosities, such that they represent strongly and weakly self-coupled sectors, is shown to be characterized by a hydrodynamic attractor which has an ea...

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Bibliographic Details
Published in:Physical review research 2020-12, Vol.2 (4), p.043320, Article 043320
Main Authors: Mitra, Toshali, Mondkar, Sukrut, Mukhopadhyay, Ayan, Rebhan, Anton, Soloviev, Alexander
Format: Article
Language:English
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Summary:The nonequilibrium evolution in a boost-invariant Bjorken flow of a hybrid viscous fluid model containing two interacting components with different viscosities, such that they represent strongly and weakly self-coupled sectors, is shown to be characterized by a hydrodynamic attractor which has an early-time behavior that is reminiscent of the so-called bottom-up thermalization scenario in heavy-ion collisions. The hydrodynamization times for the two sectors can differ strongly, with details depending on the curve realized on the two-dimensional attractor surface, which might account for different scenarios for small and large systems in nuclear collisions. The total system behaves as a single viscous fluid with a dynamically determined effective shear viscosity.
ISSN:2643-1564
2643-1564
DOI:10.1103/PhysRevResearch.2.043320