Beyond η/s = 1/4π

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Quantum oscillations and black hole ringing (2009, unknown): “[15, 16, 17, 18]).”
The Shear Viscosity to Entropy Ratio: A Status Report (2011, background): “The latter condition was shown to be generic in superconformal field theories with unequal central charges in [51], where a large class of examples of CFTs violating the bound were considered.”
Holographic GB gravity in arbitrary dimensions (2009, background): “Still the precise string theory constructions where these higher curvature terms are under control only allow for perturbative violations of the bound [24, 25, 27].”
Causality in AdS/CFT and Lovelock theory (2009, background): “Besides, quadratic curvature corrections were shown to arise in the string theory framework [14, 15, 16, 17].”
Holographic Hydrodynamics with a Chemical Potential (2009, background): “15) Note that this fixes the asymptotic behaviour g(r → ∞) → 1 + 2c1/3 which reflects the fact that, as noted in [14], the AdS scale of the background geometry is perturbed to be 1 L̂2 = 1 L2 (”