301 citations · 383 across the 12 of their papers we have counts for
12 papers
Holographic algebras at null infinity
Chang-Han Chen, Geoff Penington, Gautam Satishchandran +1
We construct an algebra of observables associated to a cut of null infinity in asymptotically flat spacetimes. The Bondi mass associated with a sharp cut of future null infinity is…
An apologia for islands
Stefano Antonini, Chang-Han Chen, Henry Maxfield +1
Entanglement islands have played a key role in the recent derivation of the Page curve and other progress on the black hole information problem. Arising from the inclusion of conne…
It costs nothing to teleport information into a black hole
Jonah Kudler-Flam, Geoff Penington
It is often claimed that adding a qubit to a black hole requires energy so that the extra Bekenstein-Hawking entropy can accommodate the qubit. In this essay,…
Generalized entropy of gravitational fluctuations
Sean Colin-Ellerin, Guanda Lin, Geoff Penington
The corrections to holographic entanglement entropy from bulk quantum fields in a classical gravitational background are now well understood. They lead, in particular, to unitary P…
Algebras and states in super-JT gravity
Geoff Penington, Edward Witten
In bosonic JT gravity, minimally coupled to bulk matter, there exists a single, delta-function-normalisable state in each representation of the matter QFT for any pair of…
The Diagonal Approximation for Holographic Rényi Entropies
Geoff Penington, Pratik Rath
Recently Dong, Rath and Kudler-Flam proposed a modified cosmic brane prescription for computing the Rényi entropy of a holographic system in the presence of multiple extremal…
A clock is just a way to tell the time: gravitational algebras in cosmological spacetimes
Chang-Han Chen, Geoff Penington
We study the algebra of observables in semiclassical quantum gravity for cosmological backgrounds, focusing on two key examples: slow-roll inflation and evaporating Schwarzschild-d…
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…
Holograms In Our World
Raphael Bousso, Geoff Penington
In AdS/CFT, the entanglement wedge EW is the portion of the bulk geometry that can be reconstructed from a boundary region ; in other words, EW is the hologram of .…
Algebras and States in JT Gravity
Geoff Penington, Edward Witten
We analyze the algebra of boundary observables in canonically quantised JT gravity with or without matter. In the absence of matter, this algebra is commutative, generated by the A…
Entanglement Wedges for Gravitating Regions
Raphael Bousso, Geoff Penington
Motivated by properties of tensor networks, we conjecture that an arbitrary gravitating region can be assigned a generalized entanglement wedge , such that quasi-lo…
An Algebra of Observables for de Sitter Space
Venkatesa Chandrasekaran, Roberto Longo, Geoff Penington +1
We describe an algebra of observables for a static patch in de Sitter space, with operators gravitationally dressed to the worldline of an observer. The algebra is a von Neumann al…