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arxiv: 1106.0782 · v2 · submitted 2011-06-04 · 🌀 gr-qc

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New Generic Ringdown Frequencies at the Birth of a Kerr Black Hole

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classification 🌀 gr-qc
keywords frequencykerrmodeblackdiscussholehorizonringdown
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We discuss a new ringdown frequency mode for vacuum perturbations of the Kerr black hole. We evolve initial data for the vacuum radial Teukolsky equation using a near horizon approximation, and find a frequency mode analogous to that found in a recent study of radiation generated by a plunging particle close to the Kerr horizon. We discuss our results in the context of that study. We also explore the utility of this mode by fitting a numerical waveform with a combination of the usual quasi-normal modes (QNMs) and the new oscillation frequency.

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  1. Pole Structure of Kerr Green's Function

    gr-qc 2026-05 unverdicted novelty 6.0

    Homogeneous solutions and connection coefficients in the radial Teukolsky equation for Kerr black holes exhibit simple poles at Matsubara frequencies that cancel in the Green's function, along with canceling zero-freq...