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26th Capra Meeting on Radiation Reaction in General Relativity

3–7 Jul 2023
Niels Bohr Institute
Europe/Copenhagen timezone

Session

Friday Afternoon

7 Jul 2023, 14:00
Chr. Hansen Auditorium (Niels Bohr Institute)

Chr. Hansen Auditorium

Niels Bohr Institute

Øster Farimagsgade 5

Conveners

Friday Afternoon: Talks

  • Scott Hughes

Friday Afternoon: Talks

  • Scott Hughes

Presentation materials

There are no materials yet.

  1. 75. Exact tridiagonalization of Teukolsky's radial equation
    Lionel London (King's College London)
    07/07/2023, 14:00

    Although solutions to Teukolsky’s radial equation play a key role in black hole perturbation theory, there are limitations in our understanding that obscure our practical use and application of e.g. QNM overtone solutions. Towards addressing these limitations, I’ll present a collection of results that conclude with the tridiagonalization of Teukolsky's radial equation. In particular, I’ll...

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  2. 64. Orthogonality and transitions between black-hole quasibound states
    Laura Sberna (Max Planck Institute for Gravitational Physics (Albert Einstein Institute), Potsdam)
    07/07/2023, 14:20

    Linear perturbations around black hole spacetimes can be quasinormal, quasibound or even superradiantly unstable, depending on the fields involved and the system's parameters. Recently, a bilinear form on perturbations of Kerr was proposed, and shown to give rise to an orthogonality relation between quasinormal modes. In this work, we extend the definition of the bilinear form and the...

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  3. 41. Modeling the ringdown of binary black hole mergers
    Mark Cheung (Johns Hopkins University)
    07/07/2023, 14:40

    The post-merger gravitational-wave waveform of binary black hole mergers can be well modeled by quasinormal modes during the late ringdown phase. The theoretical spectrum of modes that could be present in the ringdown is extensive, but in practice only a subset of them will be significantly excited. Focusing on non-precessing mergers, we determine the relevancy of different ringdown modes by...

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  4. 62. The Black Hole Perturbation Toolkit: an update
    Niels Warburton (University College Dublin)
    07/07/2023, 15:00
  5. 87. Ringdown beyond Kerr
    Aaron Zimmerman
    07/07/2023, 16:00

    While challenging in practice, measurements of multiple black hole ringdown frequencies can provide clean tests of the nature of black holes. Going beyond null tests, however, requires predictions of the ringdown spectrum in theories beyond GR and in spacetimes beyond Kerr. Such predictions also allow for optimal combinations of a large number of weaker tests. In this talk I will outline a...

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  6. 38. Perturbations of spinning black holes beyond General Relativity using Modified Teukolsky formalism
    Dongjun Li (California Institute of Technology)
    07/07/2023, 16:20

    Black hole (BH) perturbation theory is crucial in computing the quasinormal modes (QNMs) emitted by general binary BH merges and the gravitational waves (GWs) of extreme-mass-ratio-inspirals (EMRIs). These GWs carry essential information about the geometry around BHs and any potential deviations from General Relativity (GR). In recent years, there have been extensive studies of perturbations...

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