Effect of curvature squared corrections in AdS on the viscosity of the dual gauge theory
Yevgeny Kats; Pavel Petrov; Yevgeny Kats; Jefferson Physical Laboratory, Harvard University, Cambridge, MA 02138, U.S.A.; Pavel Petrov; Jefferson Physical Laboratory, Harvard University, Cambridge, MA 02138, U.S.A.
Журнал:
Journal of High Energy Physics
Дата:
2009-01-01
Аннотация:
We use the real-time finite-temperature AdS/CFT correspondence to compute the effect of general R<sup>2</sup> corrections to the gravitational action in AdS space on the shear viscosity of the dual gauge theory. The R<sup>2</sup> terms in AdS<sub>5</sub> 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 1/4π on the viscosity-to-entropy ratio is violated for finite N.
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