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Greybody Factors Imprinted on Black Hole Ringdowns: an alternative to superposed quasi-normal modes

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arxiv 2309.05725 v2 pith:5H73L43V submitted 2023-09-11 gr-qc hep-th

Naritaka Oshita This is my paper · ORCID
classification gr-qchep-th
keywords blackgreybodyholefactormodesquasi-normalringdownmass
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abstract

It is shown that the spectral amplitude of gravitational-wave (GW) ringdown of a Kerr black hole sourced by an extreme mass ratio merger can be modeled by the $\textit{greybody factor}$, which quantifies the scattering nature of the black hole geometry. The estimation of the mass and spin of the remnant is demonstrated by fitting the greybody factor to GW data without using black hole quasi-normal modes. We propose that the ringdown modeling with the greybody factor may strengthen the test of gravity as one can avoid the possible overfitting issue and the start time problem in the ringdown modeling with superposed quasi-normal modes.

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Cited by 6 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Nonlinear Dynamics near the Threshold of Gravitational Collapse

    gr-qc 2026-07 conditional novelty 7.0 of 10

    Perturbation theory around flat space fails before black hole formation once peak luminosity exceeds ~10^-2 L_Planck; near criticality the spectrum flattens to 1/ω, matching the prediction from discrete self-similarity.

  2. Waveform stability of black hole ringdown with stochastic horizon structure

    gr-qc 2026-02 conditional novelty 6.0 of 10

    Ringdown waveforms are robust against small-scale stochastic horizon fluctuations; only coherent, macroscopic horizon structure with ε≳10^-4 and L_c∼M could produce observable deviations.

  3. Spectrum instability and greybody factor stability for parabolic approximation of Regge-Wheeler potential

    gr-qc 2025-05 conditional novelty 6.0 of 10

    Replacing the Regge-Wheeler potential by piecewise parabolas makes quasinormal-mode spectra unstable, with long-lived overtones, while greybody factors stay close to the exact Schwarzschild result.

  4. Transition from Regular Black Holes to Wormholes in Covariant Effective Quantum Gravity: Scattering, Quasinormal Modes, and Hawking Radiation

    gr-qc 2025-02 conditional novelty 6.0 of 10

    For a quantum-corrected spacetime, the fundamental quasinormal mode differs little from Schwarzschild, higher overtones deviate significantly, and wormhole states have extremely long-lived modes.

  5. Echoes of a hairy black hole from gravitational decoupling

    gr-qc 2026-04 unverdicted novelty 5.0 of 10

    Axial perturbations of a gravitationally decoupled hairy black hole develop a double-peak potential that dynamically generates echo-like late-time waveforms in a suitable (α, β) region.

  6. Graybody factors and absorption cross-sections of non-exchange black holes in Instein-coupled scalar fields

    gr-qc 2025-11 conditional novelty 4.0 of 10

    Larger non-commutativity θ or Einstein-tensor coupling η suppresses the absorption cross-section of scalar waves on non-commutative black holes, and the grey-body/quasinormal correspondence holds only at large l.

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