A Viscosity Bound Conjecture

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Abstract
Exploring an extension of the correspondence between black hole physics and thermodynamics to non-equilibrium processes, we show that the ratio of shear viscosity to volume density of entropy in theories with gravity duals is equal to a universal value of \hbar/(4\pi). We conjecture that this value serves as a lower limit on the ratio of shear viscosity to entropy density for all systems realizable in nature.

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