https://doi.org/10.1140/epjc/s10052-006-0176-4
Regular Article - Theoretical Physics
The ratio of viscosity to entropy density in a pion gas satisfies the KSS holographic bound
Departamento de Física Teórica I, Universidad Complutense, 28040, Madrid, Spain
* e-mail: fllanes@fis.ucm.es
Received:
25
September
2006
Revised:
30
October
2006
Published online:
11
January
2007
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/(4π) bound. We find similar results with other sets of phase-shifts and conclude that the bound is nowhere violated.
© Springer-Verlag Berlin Heidelberg, 2007
