The ratio of viscosity to entropy density in a pion gas satisfies the KSS holographic bound

Details The ratio of viscosity to entropy density in a pion gas satisfies the KSS holographic bound The ratio of viscosity to entropy density in a pion gas satisfies the KSS holographic bound

2006-09-25

arxiv.org/abs/hep-ph/0609255v2

Eur.Phys.J.C49:1011-1013,2007

Physics

High Energy Physics

High Energy Physics - Phenomenology

2 page text, three figures. V2: short comment and graph added to assert that a minimum of eta/s is not discarded from the hadr

Scientific paper

10.1140/epjc/s10052-006-0176-4

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 the bound is nowhere violated.

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