A physical protocol for observers near the boundary to obtain bulk information in quantum gravity

Chandramouli Chowdhury; Olga Papadoulaki; Suvrat Raju

A physical protocol for observers near the boundary to obtain bulk information in quantum gravity

Not yet reviewed by Pith; the record is open.

Re-run · record.json Download PDF Read on arXiv ↗

This paper has not been read by Pith yet. Machine review is queued; the pith claim, tier, and objections will appear here once it completes.

SPECIMEN: schema-true, not a live event

T0 review · schema-true

One-sentence machine reading of the paper's core claim.

pith:XXXXXXXX · record.json · timestamp

arxiv 2008.01740 v2 pith:FXRCVX4L submitted 2020-08-04 hep-th gr-qc

A physical protocol for observers near the boundary to obtain bulk information in quantum gravity

Chandramouli Chowdhury , Olga Papadoulaki , Suvrat Raju This is my paper

classification hep-th gr-qc

keywords bulkobserversprotocolboundarygravityinformationlow-energynear

verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved

0 comments

read the original abstract

We consider a set of observers who live near the boundary of global AdS, and are allowed to act only with simple low-energy unitaries and make measurements in a small interval of time. The observers are not allowed to leave the near-boundary region. We describe a physical protocol that nevertheless allows these observers to obtain detailed information about the bulk state. This protocol utilizes the leading gravitational back-reaction of a bulk excitation on the metric, and also relies on the entanglement-structure of the vacuum. For low-energy states, we show how the near-boundary observers can use this protocol to completely identify the bulk state. We explain why the protocol fails completely in theories without gravity, including non-gravitational gauge theories. This provides perturbative evidence for the claim that one of the signatures of holography -- the fact that information about the bulk is also available near the boundary -- is already visible in the low-energy theory of gravity.

discussion (0)

Forward citations

Cited by 2 Pith papers

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

Smooth horizons from topology change in canonical quantum gravity
hep-th 2026-06 unverdicted novelty 7.0

Topology change in canonical JT gravity resolves the firewall paradox by making the connected two-interior branch dominate after Page time, with gravitational constraints annihilating the firewall branch and identifyi...
Asymptotic Algebras and Holography of Information in CGHS Model
hep-th 2026-06 unverdicted novelty 5.0

Establishes holography of information in the CGHS model via asymptotic algebras and argues that islands violate commutativity of left- and right-boundary algebras.