Homology conditions for RT surfaces in double holography

Article Astronomy & Astrophysics

Finding pythons in unexpected places

Netta Engelhardt et al.

Summary: This paper argues that novel (highly nonclassical) quantum extremal surfaces (QESs) are crucial in reconstructing the black hole interior. It suggests that any code subspace allowing the excitation of interior outgoing modes will have a QES in its maximally mixed state, making the reconstruction of these modes exponentially complex. The paper also discusses the relevance of these QESs to the geometrization of state dependence in the arguments for firewalls.

CLASSICAL AND QUANTUM GRAVITY (2022)

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Article Astronomy & Astrophysics

Entanglement between two gravitating universes

Vijay Balasubramanian et al.

Summary: We study the entangled pure state of two disjoint universes. The presence of gravity in one or both universes leads to modifications in the calculation of the entropy. When only one universe has gravity, a wormhole between the copies of the gravitating universe is included in the entropy formula. When both universes have gravity, a novel wormhole with multiple boundaries connecting replica copies of both universes dominates the path integral. The contribution from this wormhole restores unitarity.

CLASSICAL AND QUANTUM GRAVITY (2022)

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Article Astronomy & Astrophysics

A world without pythons would be so simple

Netta Engelhardt et al.

Summary: In this work, it is shown that bulk operators between the outermost extremal surface and the asymptotic boundary can be reconstructed simply in the classical limit, contrary to the Python's lunch conjecture. The 'simple wedge' reconstruction method is based on the principle of causal bulk propagation using perturbed boundary conditions. The authors also propose the Simple Entropy proposal and discuss the holographic duality of black hole uniqueness.

CLASSICAL AND QUANTUM GRAVITY (2021)

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Article Physics, Particles & Fields

Dirichlet baths and the not-so-fine-grained Page curve

Kausik Ghosh et al.

Summary: This study examines the computation of entanglement entropy on a gravitating brane, utilizing a doubly holographic prescription with a Dirichlet anchoring condition. By sliding the anchor and analyzing the strength of gravity on the brane, researchers have discovered the holographic nature of gravity and methods for resolving the information paradox. The results align with discussions on gravitating baths and emphasize the significance of the conventional Page curve in addressing the information paradox in flat space.

JOURNAL OF HIGH ENERGY PHYSICS (2021)

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Article Physics, Particles & Fields

Holographic BCFTs and communicating black holes

Hao Geng et al.

Summary: The study explores the AdS/BCFT duality between two-dimensional conformal field theories and three-dimensional anti-de Sitter space with KarchRandall branes, focusing on entanglement entropy and communication between braneworld black holes. A consistent Page curve is found, with gravitational results matching field theory calculations. At zero temperature, an interesting extension to the AdS3/BCFT2 correspondence is uncovered, revealing different gravitational duals based on the value of Delta bcc.

JOURNAL OF HIGH ENERGY PHYSICS (2021)

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Article Astronomy & Astrophysics

Information paradox and its resolution in de Sitter holography

Hao Geng et al.

Summary: The study formulates a version of the information paradox in de Sitter spacetime, which is resolved by the emergence of entanglement islands as shown in the De Sitter/de Sitter correspondence, leading to a time-dependent Page curve for the entanglement entropy. It suggests that the distribution of microscopic degrees of freedom depends on descriptions, with differences between the static and global descriptions of de Sitter spacetime.

PHYSICAL REVIEW D (2021)

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Article Physics, Particles & Fields