Abstract
The replica trick defines Rényi entropies as partition functions on conically singular geometries. We discuss their gravity duals: regular bulk solutions to the Einstein equations inducing conically singular metrics at the boundary. When the conical singularity is supported on a flat or spherical surface, these solutions are rewritings of the hyperbolic black hole. For more general shapes, these solutions are new. We construct them perturbatively in a double expansion in the distance and strength of the conical singularity, and extract the vacuum polarisation due to the cone. Recent results about the structure of logarithmic divergences of Rényi entropies are reproduced — in particular, f b ≠ f c . We discuss in detail the dynamical resolution of the singularity in the bulk. This resolution is in agreement with a previous proposal, and indicates a non-minimal settling to the ‘splitting problem’: an apparent ambiguity in the holographic entropy formula of certain theories with higher derivatives.
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Camps, J. Gravity duals of boundary cones. J. High Energ. Phys. 2016, 139 (2016). https://doi.org/10.1007/JHEP09(2016)139
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DOI: https://doi.org/10.1007/JHEP09(2016)139