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arxiv: 1102.0440 · v2 · pith:RZS3N6UCnew · submitted 2011-02-02 · ✦ hep-th · gr-qc

Towards a derivation of holographic entanglement entropy

classification ✦ hep-th gr-qc
keywords entropyentanglementstatederivationgeometryholographicthermalthermodynamic
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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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