Abstract
We provide a derivation of holographic entanglement entropy for spherical entangling surfaces. Our construction relies on conformally mapping the boundary CFT to a hyperbolic geometry and observing that the vacuum state is mapped to a thermal state in the latter geometry. Hence the conformal transformation maps the entanglement entropy to the thermodynamic entropy of this thermal state. The AdS/CFT dictionary allows us to calculate this thermodynamic entropy as the horizon entropy of a certain topological black hole. In even dimensions, we also demonstrate that the universal contribution to the entanglement entropy is given by A-type trace anomaly for any CFT, without reference to holography.
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Casini, H., Huerta, M. & Myers, R.C. Towards a derivation of holographic entanglement entropy. J. High Energ. Phys. 2011, 36 (2011). https://doi.org/10.1007/JHEP05(2011)036
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DOI: https://doi.org/10.1007/JHEP05(2011)036