Early-Stage Shear Viscosity far from Equilibrium via Holography
- Johann Wolfgang Goethe-Universität, Frankfurt (Germany)
- University of Alabama, Tuscaloosa, AL (United States)
We report shear viscosity is a crucial property of QCD matter which determines the collective behavior of the the quark-gluon plasma (QGP) in ultrarelativistic heavy-ion collisions. Extending the near-equilibrium, high-precision investigations in theory and experiment, we take into account the fact that, in a collision, the QGP is generated far from equilibrium. We use the AdS/CFT correspondence to study a strongly coupled plasma and find a significant impact on the ratio of shear viscosity to entropy density, η/s. In particular, we investigate the initial heating phase and find a decrease reaching down to below 60% followed by an overshoot to 110% of the near-equilibrium value. This finding might be highly relevant for the extraction of transport coefficients from anisotropic flow measurements at RHIC and LHC.
- Research Organization:
- Univ. of Alabama, Tuscaloosa, AL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC); Helmholtz International Center for FAIR; Helmholtz Graduate School for Hadron and Ion Research; Stiftung Polytechnische Gesellschaft Frankfurt am Main; Studienstiftung des deutschen Volkes
- Grant/Contract Number:
- SC0012447
- OSTI ID:
- 1851629
- Alternate ID(s):
- OSTI ID: 1760937
- Journal Information:
- Nuclear Physics. A, Vol. 1005, Issue C; Conference: 28. International Conference on Ultrarelativistic Nucleus-Nucleus Collisions, Wuhan (China), 4-9 Nov 2019; ISSN 0375-9474
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- United States
- Language:
- English
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