1 citations · 2 across the 5 of their papers we have counts for
5 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…
Time in gravitational subregions and in closed universes
Andreas Blommaert, Chang-Han Chen
What are gauge-invariant local observables in a subregion in quantum gravity? How does one even define such a subregion non-perturbatively? We study these questions in JT gravity.…
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…
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…
Firewalls at exponentially late times
Andreas Blommaert, Chang-Han Chen, Yasunori Nomura
We consider a version of the typical state firewall setup recently reintroduced by Stanford and Yang, who found that wormholes may create firewalls. We examine a late-time double s…