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Horizon hair of extremal black holes and measurements at null infinity

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arxiv 1809.10037 v1 pith:D43FUQCU submitted 2018-09-26 gr-qc hep-thmath.AP

Yannis Angelopoulos , Stefanos Aretakis , Dejan Gajic This is my paper · ORCID
classification gr-qchep-thmath.AP
keywords horizonblackchargesextremalholesinfinitynullperturbations
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It is shown that the conserved charges on the event horizon and the Cauchy horizon associated to scalar perturbations on extremal black holes are externally measurable from null infinity. This suggests that these charges have the potential to serve as an observational signature. The proof of this result is based on obtaining precise late-time asymptotics for the radiation field of outgoing perturbations.

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  1. Living on the Edge of Effective Field Theory: Near-Extremal Black Holes in Quadratic Gravity

    gr-qc 2026-08 conditional novelty 8.0 of 10

    Near-extremal black holes in dynamical Chern-Simons gravity have a regular extremal endpoint matching the deformed near-horizon Kerr throat, while in scalar Gauss-Bonnet gravity the extremal throat is disconnected fro...

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