Shear viscosity of a multi-component hadronic system

14th International Conference on Strangeness in Quark Matter

Wiranata, A.^1,2 ; Koch, V.^2 ; Prakash, M.^3 ; Wang, X.N.^1,2

Institute of Particle Physics, Key Laboratory of Quark and Lepton Physics (MOE), Central China Normal University, Wuhan 430079, China^1

Lawrence Berkeley National Laboratory, Nuclear Science Division, Berkeley, CA 94720, United States^2

Department of Physics and Astronomy, Ohio University, Athens, OH 45701, United States^3

关键词: Baryon number density;    Chapman-Enskog;    Entropy density;    Hadronic systems;    Multicomponents;    Parametrizations;    Unitarity;    Virial expansion;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/509/1/012049/pdf
DOI  :  10.1088/1742-6596/509/1/012049

来源: IOP

【 摘 要 】

The shear viscosity η and entropy density s of a hadron gas with zero baryon number density are calculated using the Chapman-Enskog and virial expansion approaches, respectively. Interactions are included via the K-matrix parametrization of cross sections preserving the unitarity of the S-matrix. In the four component mixture (π-K - N - η), a total of 57 resonances up to 2 GeV mass are included. Interactions forming resonances reduce the magnitude of η and increase s, both effects serving to progressively reduce η/s as the temperature nears the QCD phase transition temperature.