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Author Cremonini, Sera ♦ Gursoy, Umut ♦ Szepietowski, Phillip
Source CERN Document Server
Content type Text
File Format PDF
Date Created 2012-06-20
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics ♦ Modern physics ♦ Technology ♦ Engineering & allied operations ♦ Applied physics
Subject Keyword Particle Physics - Theory
Abstract We examine the structure of the shear viscosity to entropy density ratio eta/s in holographic theories of gravity coupled to a scalar field, in the presence of higher derivative corrections. Thanks to a non-trivial scalar field profile, eta/s in this setup generically runs as a function of temperature. In particular, its temperature behavior is dictated by the shape of the scalar potential and of the scalar couplings to the higher derivative terms. We consider a number of dilatonic setups, but focus mostly on phenomenological models that are QCD-like. We determine the geometric conditions needed to identify local and global minima for eta/s as a function of temperature, which translate to restrictions on the signs and ranges of the higher derivative couplings. Finally, such restrictions lead to an holographic argument for the existence of a global minimum for eta/s in these models, at or above the deconfinement transition.
Description Presented at: JHEP 08 (2012) 167
Learning Resource Type Article
Publisher Date 2012-01-01
Rights License Preprint: © 2012-2018 CERN (License: CC-BY-3.0)
Page Count 49