The delocalized effective degrees of freedom of a black hole at low frequencies

Barak Kol*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

5 Scopus citations


Identifying the fundamental degrees of freedom of a black hole poses a long-standing puzzle. Recently Goldberger and Rothstein forwarded a theory of the low frequency degrees of freedom within the effective field theory approach, where they are relevancy-ordered but of unclear physical origin. Here these degrees of freedom are identified with near-horizon but non-compact gravitational perturbations which are decomposed into delocalized multipoles. Their world-line (kinetic) action is determined within the classical effective field theory (CLEFT) approach and their interactions are discussed. The case of the long-wavelength scattering of a scalar wave off a Schwarzschild black hole is treated in some detail, interpreting within the CLEFT approach the equality of the leading absorption cross section with the horizon area.

Original languageAmerican English
Pages (from-to)2617-2624
Number of pages8
JournalInternational Journal of Modern Physics D
Issue number13-14
StatePublished - Dec 2008


  • Black holes
  • Effective field theory


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