Aspects of Holography in Conical $Ad{S}_3$

Abstract

We study the Feynman propagator of free scalar fields in $Ad{S}_3$ with a conical defect. The propagator is built by solving the bulk equation of motion, summing over the modes of the field, and taking the boundary limit. We then perform several consistency checks. In the dual CFT, the operator responsible for the defect creates a highly excited state. We consider the exchange of the Virasoro identity block in the heavy-light limit to obtain an expression for the propagator sensitive to the mass of the defect. In $Ad{S}_3/{\mathbb{Z}}_n$, we treat the propagator by the method of images and in the geodesic approximation. More generally, we argue that long-range correlations of the scalar are suppressed as the defect becomes more massive: we find a continuous phase transition in the correlator at the BTZ threshold and examine its critical behavior. Finally, we apply our results to holographic entanglement entropy using an analogy between our scalars and replica twist fields.

33 pages, 5 figures, JHEP style. v2: Section 4 was rewritten: an error was corrected that arose from using an approximation that did not apply. The crossing relations are now verified to all orders and do not present a puzzle any longer. The conclusions are updated based on the new calculations. Figures and references added. v3: Number of typos reduced. Supersedes the published version

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• Multiboundary wormholes and OPE statistics
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