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A Note on Black Hole Entropy and Wormhole Instabilities

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arxiv 2502.00769 v2 pith:DEYW5AHG submitted 2025-02-02 hep-th

classification hep-th
keywords instabilitiesblackeuclideanholewormholeaddressesapproachesappropriate
verification ladder T0 review T1 audit T2 compute T3 formal
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We discuss recent approaches to the computation of black hole entropies through semiclassical estimates of appropriate state overlaps, saturated by Euclidean wormhole configurations. We notice that the relevant saddle-point manifolds may exhibit instabilities, thereby compromising the interpretation of the Euclidean path integral as a tool for computing positive-definite inner products. We show that a proper treatment using a microcanonical formulation effectively addresses the puzzles posed by these instabilities.

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Cited by 2 Pith papers

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

  1. AdS Black Holes Are Short-Lived inside the Spectral Form Factor

    hep-th 2026-07 conditional novelty 6.0 of 10

    For holographic CFTs on a sphere, the large AdS black hole saddle of the spectral form factor loses dominance at t=O(β) and disconnects from the integration cycle, curing the d≡5 (mod 4) divergence.

  2. 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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