3 papers
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.…
hep-th2025
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…
hep-th2024
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…