Near-horizon Kerr Magnetosphere

Abstract

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.

8 pages, 2 figures. v2: minor edits, matches published version

References in corpus (4)

• "Meissner effect" and Blandford-Znajek mechanism in conductive black hole magnetospheres
• Gravity Waves from Extreme-Mass-Ratio Plunges into Kerr Black Holes
• Force-Free Electrodynamics around Extreme Kerr Black Holes
• The Black Hole Meissner Effect and Blandford-Znajek Jets

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