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A modular toolkit for bulk reconstruction

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arxiv 1806.10560 v2 pith:UQIEZ3WK submitted 2018-06-27 hep-th

classification hep-th
keywords modularsurfaceboundarybulkextractgeodesicstoolsallow
verification ladder T0 review T1 audit T2 compute T3 formal

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We introduce new tools for studying modular flow in AdS/CFT. These tools allow us to efficiently extract bulk information related to causality and locality. For example, we discuss the relation between analyticity in modular time and entanglement wedge nesting which can then be used to extract the location of the Ryu-Takayanagi (RT) surface directly from the boundary theory. Probing the RT surface close to the boundary our results reduce to the recent proof of the Quantum Null Energy Condition. We focus on heavy probe operators whose correlation functions are determined by spacelike geodesics. These geodesics interplay with the RT surface via a set of rules that we conjecture and give evidence for using the replica trick.

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Forward citations

Cited by 8 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Geometric Entropies and their Hamiltonian Flows

    hep-th 2025-01 accept novelty 8.0 of 10

    In JT gravity with higher-derivative scalar couplings, the geometric entropy flow generalizes the BCP kink transformation by adding delta-function singularities in the dilaton and matter fields.

  2. Uniqueness of null-local modular flow

    hep-th 2026-07 conditional novelty 7.0 of 10

    For the free massless scalar in a Minkowski causal diamond, the vacuum is the unique state or weight in the vacuum sector whose modular flow is local on the null boundary.

  3. Probing Evaporating Black Holes with Modular Flow in SYK

    hep-th 2025-12 unverdicted novelty 7.0 of 10

    Modular flow in SYK models coupled to a bath reveals singularities allowing reconstruction of bulk flow past the horizon in two-sided AdS2 black holes.

  4. The algebraic structure of gravitational scrambling

    hep-th 2025-08 conditional novelty 7.0 of 10

    The paper builds an operator algebra, the modular-twisted product, that captures black hole scrambling exactly at the scrambling time and reduces to previously known free and tensor product algebras in the appropriate limits.

  5. Geometric modular flows in 2d CFT and beyond

    hep-th 2025-02 conditional novelty 7.0 of 10

    In 2d CFTs, every suitably regular Unruh flow on the Rindler wedge is the modular flow of a state obtained by a conformal unitary acting on the vacuum or thermal state, and local entropy and stress-tensor formulas follow.

  6. Type III von Neumann Algebras are Magical

    hep-th 2026-08 reject novelty 6.0 of 10

    If lattice states in the thermodynamic limit have bounded magic, the local von Neumann algebra cannot be Type III, so Type III algebras require infinite magic.

  7. Modular Witten Diagrams and Quantum Extremality

    hep-th 2025-12 unverdicted novelty 6.0 of 10

    Modular Witten diagrams reproduce the O(λ² G_N) correction to holographic entanglement entropy, matching the canonical energy term in the quantum Ryu-Takayanagi formula with wedge shape deformation.

  8. The Baby Universe is Fine and the CFT Knows It: On Holography for Closed Universes

    hep-th 2025-07 conditional novelty 5.0 of 10

    A closed universe in AdS/CFT is not ruled out by recent SWAP-test arguments; the one-dimensional Hilbert space seen from the CFT is external indistinguishability, and CFT data can reconstruct the closed universe's geometry.

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