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Shear viscosity of hadrons with K-matrix cross sections
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Shear viscosity \eta and entropy density s of a hadronic resonance gas are calculated using the Chapman-Enskog and virial expansion methods using the K-matrix parametrization of hadronic cross sections which preserves the unitarity of the T -matrix. In the \pi-K-N-\eta- mixture considered, a total of 57 resonances up to 2 GeV were included. Comparisons are also made to results with other hadronic cross sections such as the Breit-Wigner (BW) and, where available, experimental phase shift parametrizations. Hadronic interactions forming resonances are shown to decrease the shear viscosity and increase the entropy density leading to a substantial reduction of \eta/s as the QCD phase transition temperature is approached.
Forward citations
Cited by 2 Pith papers
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Bulk viscosity of a binary mixture: the role of the intra-species interaction
Derives second-order Chapman-Enskog bulk viscosity for binary mixtures showing improved physical properties and agreement with Green-Kubo.
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Viscous coefficients and thermal conductivity of a $\pi K N$ gas mixture in the medium
Transport coefficients of a hot πKN gas are computed with in-medium cross sections from thermal field theory, showing medium effects increase relaxation times and modify η, ζ, and λ.
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