Quantum hair and quantum gravity

Sidney Coleman, Lawrence Krauss, John Preskill, Frank Wilczek

Research output: Contribution to journalArticlepeer-review

7 Scopus citations


A black hole may carry quantum numbers that are not associated with massless gauge fields, contrary to the spirit of the "no-hair" theorems. The "quantum hair" is invisible in the classical limit, but measurable via quantum interference experiments. Quantum hair alters the temperature of the radiation emitted by a black hole. It also induces non-zero expectation values for fields outside the event horizon; these expectation values are non-perturbative in ℏ, and decay exponentially far from the hole. The existence of quantum hair demonstrates that a black hole can have an intricate quantum-mechanical structure that is completely missed by standard semiclassical theory.

Original languageEnglish (US)
Pages (from-to)9-16
Number of pages8
JournalGeneral Relativity and Gravitation
Issue number1
StatePublished - Jan 1 1992
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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