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Phys Rev Lett. 2005 Mar 25;94(11):111601. Epub 2005 Mar 22.

Viscosity in strongly interacting quantum field theories from black hole physics.

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Kavli Institute for Theoretical Physics, University of California, Santa Barbara, CA 93106, USA.


The ratio of shear viscosity to volume density of entropy can be used to characterize how close a given fluid is to being perfect. Using string theory methods, we show that this ratio is equal to a universal value of variant Planck's over 2pi/4pik(B) for a large class of strongly interacting quantum field theories whose dual description involves black holes in anti-de Sitter space. We provide evidence that this value may serve as a lower bound for a wide class of systems, thus suggesting that black hole horizons are dual to the most ideal fluids.

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