A1 Journal article (refereed)
Temperature dependence of η/s of strongly interacting matter : effects of the equation of state and the parametric form of (η/s)(T) (2020)

Auvinen, Jussi; Eskola, Kari J.; Huovinen, Pasi; Niemi, Harri; Paatelainen, Risto; Petreczky, Péter (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), 044911. DOI: 10.1103/physrevc.102.044911

JYU authors or editors

Publication details

All authors or editors: Auvinen, Jussi; Eskola, Kari J.; Huovinen, Pasi; Niemi, Harri; Paatelainen, Risto; Petreczky, Péter

Journal or series: Physical Review C

ISSN: 2469-9985

eISSN: 2469-9993

Publication year: 2020

Volume: 102

Issue number: 4

Article number: 044911

Publisher: American Physical Society (APS)

Publication country: United States

Publication language: English

DOI: https://doi.org/10.1103/physrevc.102.044911

Open Access: Open access publication published in a hybrid channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/72358

Web address of parallel published publication (pre-print): https://arxiv.org/abs/2006.12499

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

Keywords: particle physics; nuclear physics

Free keywords: collective flow; equations of state of nuclear matter; hydrodynamic models; quark-gluon plasma; relativistic heavy-ion collisions

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