Effect of curvature squared corrections in AdS on the viscosity of the dual gauge theory

Details Effect of curvature squared corrections in AdS on the viscosity of the dual gauge theory Effect of curvature squared corrections in AdS on the viscosity of the dual gauge theory

2007-12-05

arxiv.org/abs/0712.0743v4

JHEP 0901:044,2009

Physics

High Energy Physics

High Energy Physics - Theory

18 pages; v4: added note and references; published version

Scientific paper

10.1088/1126-6708/2009/01/044

We use the real-time finite-temperature AdS/CFT correspondence to compute the effect of general R^2 corrections to the gravitational action in AdS space on the shear viscosity of the dual gauge theory. The R^2 terms in AdS_5 are determined by the central charges of the CFT. We present an example of a four-dimensional gauge theory in which the conjectured lower bound of 1/(4\pi) on the viscosity-to-entropy ratio is violated for finite N.

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