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Peter Baumgartner
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Holography for Einstein-Maxwell-dilaton theories from generalized dimensional reduction
Blaise Goutéraux
et al.
Oct 11, 2011
We show that a class of Einstein-Maxwell-Dilaton (EMD) theories are relatedto higher dimensional AdS-Maxwell gravity via a dimensional reduction overcompact Einstein spaces combined with continuation in the dimension of thecompact space to non-integral values (`generalized dimensional reduction').This relates (fairly complicated) black hole solutions of EMD theories tosimple black hole/brane solutions of AdS-Maxwell gravity and explains theirproperties. The generalized dimensional reduction is used to infer theholographic dictionary and the hydrodynamic behavior for this class of theoriesfrom those of AdS. As a specific example, we analyze the case of a black branecarrying a wave whose universal sector is described by gravity coupled to aMaxwell field and two neutral scalars. At thermal equilibrium and finitechemical potential the two operators dual to the bulk scalar fields acquireexpectation values characterizing the breaking of conformal and generalizedconformal invariance. We compute holographically the first order transportcoefficients (conductivity, shear and bulk viscosity) for this system.
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