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Quantum State of a Gravitating Spacetime Region
Raphael Bousso, Sami Kaya, Guanda Lin +1
We associate a gravitational Hilbert space to any closed compact -manifold with real metric. A quantum state is a -manifold bounded by…
Quantum State of a Gravitating Region
Raphael Bousso, Sami Kaya, Guanda Lin +1
We propose that any compact -manifold with elliptic data, , prepares a quantum state on its -boundary . Elliptic data consists of me…
Consistent Evaluation of the No-Boundary Proposal
Ahmed I. Abdalla, Stefano Antonini, Raphael Bousso +3
We revisit the Hartle-Hawking no-boundary proposal. To extract probabilities, one must use the gravitational path integral (GPI) to compute not only the no-boundary amplitude, but…
Fundamental Complement of a Gravitating Region
Raphael Bousso, Sami Kaya
Any gravitating region in any spacetime gives rise to a generalized entanglement wedge, the hologram . Holograms exhibit properties expected of fundamental operator algeb…
Simple Holography in General Spacetimes
Raphael Bousso, Elisa Tabor
The simple or "outermost" wedge in AdS is the portion of the entanglement wedge that can be reconstructed with sub-exponential effort from CFT data. Here we furnish a definition in…
Firewalls From General Covariance
Raphael Bousso
I define "horizon normalcy" as the approximate validity of Semiclassical Gravity and Effective Field Theory (SGEFT), for the description of observers that approach or cross a black…
Holographic Entropy Cone Beyond AdS/CFT
Raphael Bousso, Sami Kaya
We extend all known area inequalities obeyed by Ryu-Takayanagi surfaces of AdS boundary regions -- the holographic entropy cone -- to static generalized entanglement wedges of bulk…
Robust Singularity Theorem
Raphael Bousso
We prove the Penrose-Wall singularity theorem in the full semiclassical gravity regime, significantly expanding its range of validity. To accomplish this, we modify the definition…
Discrete Max-Focusing
Raphael Bousso, Elisa Tabor
The Quantum Focusing Conjecture (QFC) lies at the foundation of holography and semiclassical gravity. The QFC implies the Bousso bound and the Quantum Null Energy Condition (QNEC).…
Geometric Quantum States Beyond AdS/CFT
Raphael Bousso, Sami Kaya
We characterize the quantum states dual to entanglement wedges in arbitrary spacetimes, in settings where the matter entropy can be neglected compared to the geometric entropy. In…
Islands Far Outside the Horizon
Raphael Bousso, Geoff Penington
Information located in an entanglement island in semiclassical gravity can be nonperturbatively reconstructed from distant radiation, implying a radical breakdown of effective fiel…