323 research outputs found
The shear viscosity of holographic superfluids
We study the ratio of the shear viscosity to the entropy density for various
holographic superfluids. For the s-wave case, the ratio has the universal value
1/(4pi) as in various holographic models. For the p-wave case, there are two
shear viscosity coefficients because of the anisotropic boundary spacetime, and
one coefficient has the universal value. For the (p+ip)-wave case, the existing
technique is not applicable since there is no tensor mode of metric
perturbations which decouples from Yang-Mills perturbations. Our results
indicate that the shear viscosity does not show a singular behavior at the
critical point for holographic superfluids.Comment: 22 pages, PTPTe
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