A bstract 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 ∼ (rₛ²GN)1/D r s 2 G N 1 / D , below which some breakdown of effective field theory may occur.
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Banks et al. (2024) studied this question.
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