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26th Capra Meeting on Radiation Reaction in General Relativity

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

Session

Monday Afternoon

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

Chr. Hansen Auditorium

Niels Bohr Institute

Øster Farimagsgade 5

Conveners

Monday Afternoon: Talks 1

  • Barry Wardell

Monday Afternoon: Talks 2

  • Barry Wardell

Presentation materials

There are no materials yet.

  1. 48. Progress toward complete inspiral-merger-ringdown waveforms at 1PA order
    Adam Pound (University of Southampton)
    03/07/2023, 14:00

    The only available 1PA waveform model, developed by the Southampton-UCD collaboration, is currently limited to the strong-field inspiral stage of quasicircular binaries. In this talk, I discuss progress toward developing a complete model that includes the early inspiral and the final merger and ringdown. A companion talk by Lorenzo Kuchler will provide further details of how we model the merger phase.

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  2. 80. Waveforms from plunges into a Schwarzschild black hole
    Lorenzo Küchler (Université libre de Bruxelles - KU Leuven)
    03/07/2023, 14:20

    Within general relativity, the planar motion of a small body around a supermassive Schwarzschild black hole admits a quasi-circular inspiral followed by a transition across the innermost stable circular orbit (ISCO) and a final plunge behind the event horizon. Waveforms from second-order self-force theory compare remarkably well with numerical relativity simulations in the regime of...

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  3. 56. Distributional sources for the second-order Einstein and Teukolsky equations
    Samuel Upton (Astronomical Institute of the Czech Academy of Sciences)
    03/07/2023, 14:40

    To date, the only existing second-order self-force calculations have used some variant of a puncture scheme. In this scheme, one replaces the small object with a local singularity possessing the same curvature structure. This puncture field is truncated at some suitable distance from the particle and is then used as a source to solve for the residual field. From this, one can reconstruct the...

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  4. 35. Flux-balance laws from an effective stress-energy tensor
    Alexander Grant (University of Virginia)
    03/07/2023, 15:40

    The trajectory of a point particle can be represented by a series of geodesics whose constants of motion slowly evolve over the inspiral. Flux-balance laws give the (averaged) evolution of these "conserved quantities" in terms of fluxes of conserved currents through the horizon and at null infinity. In the specific case of conserved quantities coming from spacetime isometries (for example,...

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  5. 59. 2nd-order self-force: mode decomposition of the 1st-order puncture
    Jonathan Thornburg
    03/07/2023, 16:00

    As part of computing the 2nd order gravitational self-force in Schwarzschild (see talks by Pound, Wardell, Upton, and others), we need to decompose the 1st-order puncture field into Barack-Lousto-Sago (BLS) tensor-spherical-harmonic components. Conceptually this is easy: we just integrate the puncture field against each BLS basis function. In practice, there are many thousands of such...

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