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A World without Pythons would be so Simple

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arxiv 2102.07774 v2 pith:6YAFYSTD submitted 2021-02-15 hep-th gr-qcquant-ph

classification hep-thgr-qcquant-ph
keywords simplestatedualextremaloutermostsurfaceboundaryholographic
verification ladder T0 review T1 audit T2 compute T3 formal
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We show that bulk operators lying between the outermost extremal surface and the asymptotic boundary admit a simple boundary reconstruction in the classical limit. This is the converse of the Python's lunch conjecture, which proposes that operators with support between the minimal and outermost (quantum) extremal surfaces - e.g. the interior Hawking partners - are highly complex. Our procedure for reconstructing this "simple wedge" is based on the HKLL construction, but uses causal bulk propagation of perturbed boundary conditions on Lorentzian timefolds to expand the causal wedge as far as the outermost extremal surface. As a corollary, we establish the Simple Entropy proposal for the holographic dual of the area of a marginally trapped surface as well as a similar holographic dual for the outermost extremal surface. We find that the simple wedge is dual to a particular coarse-grained CFT state, obtained via averaging over all possible Python's lunches. An efficient quantum circuit converts this coarse-grained state into a "simple state" that is indistinguishable in finite time from a state with a local modular Hamiltonian. Under certain circumstances, the simple state modular Hamiltonian generates an exactly local flow; we interpret this result as a holographic dual of black hole uniqueness.

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Cited by 4 Pith papers

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

  1. The Making of von Neumann Algebras from Bulk Focusing

    hep-th 2025-09 conditional novelty 7.0 of 10

    A boundary region's infinite-N operator algebra is a von Neumann algebra exactly when its generalized causal wedge closes on the same region; null geodesic focusing is the bulk mechanism.

  2. On the stabilizer complexity of Hawking radiation

    hep-th 2025-10 conditional novelty 6.0 of 10

    In the PSSY model, the Wigner negativity (stabilizer magic) of Hawking radiation is O(1) before the Page time and grows as sqrt(2/pi) exp((S_max - S_2)/2) afterward; a similar formula is proposed for holographic state...

  3. An apologia for islands

    hep-th 2025-06 conditional novelty 6.0 of 10

    Entanglement islands and Page curves can arise in massless gravity without an external bath, and compactly supported gauge-invariant operators exist in islands around generic symmetry-breaking black hole backgrounds.

  4. On tests for baby universes in AdS/CFT

    hep-th 2025-07 conditional novelty 5.0 of 10

    With a post-selected holographic map for the baby universe, the Engelhardt-Gesteau swap test cannot distinguish the two candidate bulk duals.

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