Abstract
We study two-dimensional Einstein-aether (or equivalently Hořava-Lifshitz) gravity, which has an AdS 2 solution. We examine various properties of this solution in the context of holography. We first show that the asymptotic symmetry group is the full set of time reparametrizations, the one-dimensional conformal group. At the same time there are configurations with finite energy and temperature, which indicate a violation of the Ward identity associated with one-dimensional conformal invariance. These solutions are characterized by a universal causal horizon and we show that the associated entropy of the universal horizon scales with the logarithm of the temperature. We discuss the puzzles associated with this result and argue that the violation of the Ward identity is associated with a type of explicit breaking of time reparametrizations in the hypothetical 0 + 1 dimensional dual system.
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Eling, C. Holography and AdS 2 gravity with a dynamical aether. J. High Energ. Phys. 2017, 147 (2017). https://doi.org/10.1007/JHEP07(2017)147
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DOI: https://doi.org/10.1007/JHEP07(2017)147