Near-horizon Kerr magnetosphere

Samuel E. Gralla, Alexandru Lupsasca, Andrew Strominger

Research output: Contribution to journalArticlepeer-review

33 Scopus citations


We exploit the near-horizon conformal symmetry of rapidly spinning black holes to determine universal properties of their magnetospheres. Analytic expressions are derived for the limiting form of the magnetosphere in the near-horizon region. The symmetry is shown to imply that the black hole Meissner effect holds for free Maxwell fields but is generically violated for force-free fields. We further show that in the extremal limit, near-horizon plasma particles are infinitely boosted relative to accretion flow. Active galactic nuclei powered by rapidly spinning black holes are therefore natural sites for high-energy particle collisions.

Original languageEnglish (US)
Article number104041
JournalPhysical Review D
Issue number10
StatePublished - May 23 2016

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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