Poking Holes in AdS/CFT: Bulk Fields from Boundary States

Abstract

We propose an intrinsic CFT definition of local bulk operators in AdS3/CFT2 in terms of twisted Ishibashi boundary states. The bulk field Phi(X) creates a cross cap, a circular hole with opposite edge points identified, in the CFT space-time. The size of the hole is parameterized by the holographic radial coordinate y. Our definition is state-independent, non-perturbative, and does not presume or utilize a semi-classical bulk geometry. We argue that, at large central charge, the matrix element between highly excited states satisfies the bulk wave equation in the AdS black hole background.

5 pages, 3 figures. Version 2: definition of the bulk operators is modified via the inclusion of an alternating sign: it creates a cross-cap instead of a hole with reflecting boundary. Other main conclusions are unaltered

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