Viscosity in Strongly Interacting Quantum Field Theories from Black Hole Physics

Details Viscosity in Strongly Interacting Quantum Field Theories from Black Hole Physics Viscosity in Strongly Interacting Quantum Field Theories from Black Hole Physics

2004-05-26

arxiv.org/abs/hep-th/0405231v2

Phys.Rev.Lett. 94 (2005) 111601

Physics

High Energy Physics

High Energy Physics - Theory

9 pages, title changed, appendix moved into the main text

Scientific paper

10.1103/PhysRevLett.94.111601

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 $\hbar/4\pi k_B$ 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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