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HKLL for the non-normalizable mode

Bhattacharjee, B and Krishnan, C and Sarkar, D (2022) HKLL for the non-normalizable mode. In: Journal of High Energy Physics, 2022 (12).

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Official URL: https://doi.org/10.1007/JHEP12(2022)075


We discuss various aspects of HKLL bulk reconstruction for the free scalar field in AdSd+1. First, we consider the spacelike reconstruction kernel for the non-normalizable mode in global coordinates. We construct it as a mode sum. In even bulk dimensions, this can be reproduced using a chordal Green’s function approach that we propose. This puts the global AdS results for the non-normalizable mode on an equal footing with results in the literature for the normalizable mode. In Poincaré AdS, we present explicit mode sum results in general even and odd dimensions for both normalizable and non-normalizable kernels. For generic scaling dimension ∆, these can be re-written in a form that matches with the global AdS results via an antipodal mapping, plus a remainder. We are not aware of a general argument in the literature for dropping these remainder terms, but we note that a slight complexification of a boundary spatial coordinate (which we call an iϵ prescription) allows us to do so in cases where ∆ is (half-) integer. Since the non-normalizable mode turns on a source in the CFT, our primary motivation for considering it is as a step towards understanding linear wave equations in general spacetimes from a holographic perspective. But when the scaling dimension ∆ is in the Breitenlohner-Freedman window, we note that the construction has some interesting features within AdS/CFT. © 2022, The Author(s).

Item Type: Journal Article
Publication: Journal of High Energy Physics
Publisher: Springer Science and Business Media Deutschland GmbH
Additional Information: The copyright for this article belongs to Springer Science and Business Media Deutschland GmbH.
Keywords: AdS-CFT Correspondence; Gauge-Gravity Correspondence; Models of Quantum Gravity
Department/Centre: Division of Physical & Mathematical Sciences > Centre for High Energy Physics
Date Deposited: 23 Jan 2023 11:23
Last Modified: 23 Jan 2023 11:23
URI: https://eprints.iisc.ac.in/id/eprint/79187

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