%0 Journal Article
%A Dobado González, Antonio
%A Llanes Estrada, Felipe José
%T The ratio of viscosity to entropy density in a pion gas satisfies the KSS holographic bound
%D 2007
%@ 1434-6044
%U https://hdl.handle.net/20.500.14352/50720
%X We evaluate the ratio of shear viscosity to entropy density in a pion gas employing the Uehling-Uehlenbeck equation and experimental phase-shifts parameterized by means of the SU(2) inverse amplitude method. We find that the ratio for this monocomponent gas stays well above the KSS 1/(4 pi) bound. We find similar results with other sets of phase-shifts and conclude that the bound is nowhere violated.
%~