Breakdown of Field Theory in Near-Horizon Regions
arXiv:2401.03572
Abstract
We discuss back-reaction in the semiclassical treatment of quantum fields near a black hole. When the state deviates significantly from Hartle-Hawking, simple energetic considerations of back-reaction give rise to a characteristic radial distance scale , below which some breakdown of effective field theory may occur.
13 pages. v3: refs added. v2: minor clarifications