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Frederick Bingham
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Holographic Models for Theories with Hyperscaling Violation

abebe asale et al.Dec 13, 2012
We study in detail a variety of gravitational toy models forhyperscaling-violating Lifshitz (hvLif) space-times. These space-times havebeen recently explored as holographic dual models for condensed matter systems.We start by considering a model of gravity coupled to a massive vector fieldand a dilaton with a potential. This model supports the full class of hvLifspace-times and special attention is given to the particular values of thescaling exponents appearing in certain non-Fermi liquids. We study linearizedperturbations in this model, and consider probe fields whose interactions mimicthose of the perturbations. The resulting equations of motion for the probefields are invariant under the Lifshitz scaling. We deriveBreitenlohner-Freedman-type bounds for these new probe fields. For the cases ofinterest the hvLif space-times have curvature invariants that blow up in theUV. We study the problem of constructing models in which the hvLif space-timecan have an AdS or Lifshitz UV completion. We also analyze reductions ofSchroedinger space-times and reductions of waves on extremal (intersecting)branes, accompanied by transverse space reductions, that are solutions tosupergravity-like theories, exploring the allowed parameter range of the hvLifscaling exponents.
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