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Near-horizon Kerr Magnetosphere

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arxiv 1602.01833 v2 pith:P3PDOGLU submitted 2016-02-04 hep-th astro-ph.HEgr-qc

Samuel E. Gralla , Alexandru Lupsasca , Andrew Strominger This is my paper · ORCID
classification hep-thastro-ph.HEgr-qc
keywords near-horizonblackfieldsholesmagnetosphererapidlyspinningsymmetry
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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.

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  1. Photon rings in a holographic toy model

    hep-th 2025-06 conditional novelty 6.0 of 10

    In warped AdS3 black holes, the eikonal quasinormal-mode spectrum is governed exactly by the photon ring's orbital frequency and Lyapunov exponent, with different boundary conditions picking out the outer or inner ring.

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