Early time dynamics far from equilibrium via holography
- We investigate the early time dynamics of heavy ion collisions studying the time evolution of the energy-momentum tensor as well as energy-momentum correlations within a uniformly thermalizing holographic QGP. From these quantities, we suggest a far-from equilibrium definition of shear viscosity, which is a crucial property of QCD matter as it significantly determines the generation of elliptic flow already at early times. During an exemplary initial heating phase of the holographic QGP the shear viscosity of entropy density ratio decreases down to 60%, followed by an overshoot to 110% of the near-equilibrium value, η/s=1/(4π). Implications for the QCD QGP are discussed. Subsequently, we consider a holographic QGP which is Bjorken-expanding. Its energy-momentum tensor components have a known hydrodynamic attractor to which all time evolutions collapse independent of the initial conditions. Based on this, we propose a definition for a far from equilibrium speed of sound, and analytically compute its hydrodynamic attractor. Subjecting this Bjorken-expanding plasma to an external magnetic field and an axial chemical potential, we study the chiral magnetic effect far from equilibrium.
Author: | Matthias KaminskiORCiDGND, Casey CartwrightORCiD, Marco KnipferORCiD, Michael Florian WondrakORCiDGND, Björn Peter SchenkeORCiDGND, Marcus BleicherORCiDGND |
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URN: | urn:nbn:de:hebis:30:3-863874 |
DOI: | https://doi.org/10.22323/1.438.0037 |
ISSN: | 1824-8039 |
ArXiv Id: | http://arxiv.org/abs/2309.06435 |
Parent Title (English): | Proceedings of Science |
Publisher: | SISSA |
Place of publication: | Trieste |
Document Type: | Article |
Language: | English |
Date of Publication (online): | 2024/02/16 |
Date of first Publication: | 2024/02/16 |
Publishing Institution: | Universitätsbibliothek Johann Christian Senckenberg |
Contributing Corporation: | International Conference on Hard and Electromagnetic Probes of High Energy Nuclear Collisions (11. : 2023 : Aschaffenburg) |
Release Date: | 2024/08/06 |
Volume: | 438 |
Issue: | 037 |
Article Number: | 037 |
Page Number: | 6 |
Institutes: | Physik / Physik |
Dewey Decimal Classification: | 5 Naturwissenschaften und Mathematik / 53 Physik / 530 Physik |
Sammlungen: | Universitätspublikationen |
Licence (German): | Creative Commons - CC BY-NC-ND - Namensnennung - Nicht kommerziell - Keine Bearbeitungen 4.0 International |