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hep-th2026
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…
hep-th2026
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.…