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From bulk loops to boundary large-N expansion

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arxiv 1908.03974 v2 pith:YZ77FRJM submitted 2019-08-11 hep-th

From bulk loops to boundary large-N expansion

classification hep-th
keywords boundarycutsdiagramdiagramslarge-namplitudeanalysisanalytic
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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We study the analytic structure of loop Witten diagrams in Euclidean AdS represented by their conformal partial wave expansions. We show that, as in flat space, amplitude's singularities are associated with non-trivial cuts of the diagram and factorize into products of the coefficient functions for the subdiagrams resulting from these cuts. We consider an example of a one-loop four-point diagram in detail and then briefly discuss how the procedure can be extended to more general diagrams. Finally, we show that this analysis reproduces simple relations that follow from the large-N considerations on the boundary.

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Cited by 3 Pith papers

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    Computes closed-form one-loop anomalous dimensions for all double-trace operators [φφ]_{n,ℓ} in Φ⁴ theory in AdS₃ for arbitrary n, ℓ and Δ_φ > 1.

  2. Loops Outside a Black Hole

    hep-th 2025-09 conditional novelty 6.0

    Conjecture reducing bulk loop discontinuity integrals in black hole Schwinger-Keldysh geometry to exterior real-time finite-temperature loop integrals, checked at one to three loops for low-point functions.

  3. Bulk-to-bulk photon propagator in AdS

    hep-th 2025-10 unverdicted novelty 5.0

    Derives photon bulk-to-bulk propagators in AdS in multiple gauges by tensor decomposition and form-factor solution, recovering prior results and adding new expressions with improved IR behavior in Fried-Yennie gauge.