3 papers
hep-th2026
A Semiclassical Diagnostic for Spacetime Emergence
Netta Engelhardt, Elliott Gesteau
Recent developments have shown that some semiclassical spacetimes cannot emerge from a traditional application of the rules of holography, prompting proposals for restoring their e…
hep-th2025
Observer complementarity for black holes and holography
Netta Engelhardt, Elliott Gesteau, Daniel Harlow
We present a mathematical formulation of black hole complementarity based on recent rules for including the observer in quantum cosmology. We argue that this provides a self-consis…
hep-th2025
Further Evidence Against a Semiclassical Baby Universe in AdS/CFT
Netta Engelhardt, Elliott Gesteau
We argue that a large class of asymptotically AdS geometries with a semiclassical baby universe cannot be realized within the AdS/CFT correspondence. This in particular resolves a…