Temperature dependence of η/s of strongly interacting matter : effects of the equation of state and the parametric form of (η/s)(T)
Abstract
We investigate the temperature dependence of the shear viscosity to entropy density ratio η/s using a piecewise linear parametrization. To determine the optimal values of the parameters and the associated uncertainties, we perform a global Bayesian model-to-data comparison on Au+Au collisions at √sNN=200 GeV and Pb+Pb collisions at 2.76 TeV and 5.02 TeV, using a 2+1D hydrodynamical model with the Eskola-Kajantie-Ruuskanen-Tuominen (EKRT) initial state. We provide three new parametrizations of the equation of state (EoS) based on contemporary lattice results and hadron resonance gas, and use them and the widely used s95p parametrization to explore the uncertainty in the analysis due to the choice of the equation of state. We find that η/s is most constrained in the temperature range T≈150–220 MeV, where, for all EoSs, 0.08
Main Authors
Format
Articles
Research article
Published
2020
Series
Subjects
Publication in research information system
Publisher
American Physical Society (APS)
The permanent address of the publication
https://urn.fi/URN:NBN:fi:jyu-202010276406Käytä tätä linkitykseen.
Review status
Peer reviewed
ISSN
2469-9985
DOI
https://doi.org/10.1103/physrevc.102.044911
Language
English
Published in
Physical Review C
Citation
- Auvinen, J., Eskola, K. J., Huovinen, P., Niemi, H., Paatelainen, R., & Petreczky, P. (2020). Temperature dependence of η/s of strongly interacting matter : effects of the equation of state and the parametric form of (η/s)(T). Physical Review C, 102(4), Article 044911. https://doi.org/10.1103/physrevc.102.044911
License
Funder(s)
Research Council of Finland
Funding program(s)
Academy Project, AoF
Akatemiahanke, SA
Additional information about funding
J.A. and P.H. were supported by the European Research Council, Grant No. ERC-2016-COG:725741; P.H. was also supported by National Science Center, Poland, under grant Polonez DEC-2015/19/P/ST2/03333 receiving funding from the European Union's Horizon 2020 research and innovation program under Marie Skłodowska-Curie Grant Agreement No. 665778; K.J.E. and H.N. were supported by the Academy of Finland, Project No. 297058; and P.P. was supported by the US Department of Energy under Contract No. DE-SC0012704.
Copyright© 2020 the Authors