A no-cloning-style bound proves that observable exterior quantum hair on semiclassical black holes is incompatible with exact horizon smoothness unless the infalling state is pre-entangled.
Witten, Journal of High Energy Physics2022, 8 (2022)
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A No-Cloning Trade-off Between Black Hole No-Hair and Horizon Smoothness
A no-cloning-style bound proves that observable exterior quantum hair on semiclassical black holes is incompatible with exact horizon smoothness unless the infalling state is pre-entangled.