3 papers
hep-th2026
Quantum Fluctuations of the Black Hole Horizon
Ben Freivogel, Antony Speranza, Erik Verlinde
Classical black holes have sharply defined event horizons, but quantum mechanically the horizon acquires a quantum uncertainty, called the `quantum width' by Marolf. We propose a d…
hep-th2025
An intrinsic cosmological observer
Antony J. Speranza
There has been much recent interest in the necessity of an observer degree of freedom in the description of local algebras in semiclassical gravity. In this work, we describe an ex…
hep-th2025
Holographic observers for time-band algebras
Kristan Jensen, Suvrat Raju, Antony J. Speranza
We study the algebra of observables in a time band on the boundary of anti-de Sitter space in a theory of quantum gravity. Strictly speaking this algebra does not have a commutant…