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arxiv: 1608.00305 · v3 · pith:4AD5QVWLnew · submitted 2016-08-01 · ✦ hep-th · gr-qc

Entanglement entropy for free scalar fields in AdS

classification ✦ hep-th gr-qc
keywords entropyentanglementfieldsfreescalarboundarycomputedifference
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We compute entanglement entropy for free massive scalar fields in anti-de Sitter (AdS) space. The entangling surface is a minimal surface whose boundary is a sphere at the boundary of AdS. The entropy can be evaluated from the thermal free energy of the fields on a topological black hole by using the replica method. In odd-dimensional AdS, exact expressions of the Renyi entropy $S_n$ are obtained for arbitrary $n$. We also evaluate 1-loop corrections coming from the scalar fields to holographic entanglement entropy. Applying the results, we compute the leading difference of entanglement entropy between two holographic CFTs related by a renormalization group flow triggered by a double trace deformation. The difference is proportional to the shift of a central charge under the flow.

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