101 research outputs found
Electromagnetic radiation generated by a charged particle plunging into a Schwarzschild black hole: Multipolar waveforms and ringdowns
Electromagnetic radiation emitted by a charged particle plunging from
slightly below the innermost stable circular orbit into a Schwarzschild black
hole is examined. Both even- and odd-parity electromagnetic perturbations are
considered. They are described by using gauge invariant master functions and
the regularized multipolar waveforms as well as their unregularized
counterparts constructed from the quasinormal-mode spectrum are obtained for
arbitrary directions of observation and, in particular, outside the orbital
plane of the plunging particle. They are in excellent agreement and the results
especially emphasize the impact of higher harmonics on the distortion of the
waveforms.Comment: v2: Figures 1 and 7 modified. Minor changes in the text to match the
published versio
Multipolar gravitational waveforms and ringdowns generated during the plunge from the innermost stable circular orbit into a Schwarzschild black hole
We study the gravitational radiation emitted by a massive point particle
plunging from slightly below the innermost stable circular orbit into a
Schwarzschild black hole. We consider both even- and odd-parity perturbations
and describe them using the two gauge-invariant master functions of Cunningham,
Price, and Moncrief. We obtain, for arbitrary directions of observation and, in
particular, outside the orbital plane of the plunging particle, the regularized
multipolar waveforms, i.e., the waveforms constructed by summing over of a
large number of modes, and their unregularized counterparts constructed from
the quasinormal-mode spectrum. They are in excellent agreement and our results
permit us to especially emphasize the impact on the distortion of the waveforms
of (i) the harmonics beyond the dominant modes and (ii) the
direction of observation, and therefore the necessity to take them into account
in the analysis of the last phase of binary black hole coalescence.Comment: arXiv admin note: substantial text overlap with arXiv:1805.11950 v2:
Includes a comparison with results obtained in Refs. [19] and [20] and
matches the version to appear in PR
Regge pole description of scattering of gravitational waves by a Schwarzschild black hole
International audienceWe revisit the problem of plane monochromatic gravitational waves impinging upon a Schwarzschild black hole using complex angular momentum techniques. By extending our previous study concerning scalar and electromagnetic waves [A. Folacci and M. Ould El Hadj, Phys. Rev. D 99, 104079 (2019)PRVDAQ2470-001010.1103/PhysRevD.99.104079], we provide complex angular momentum representations and Regge pole approximations of the helicity-preserving and helicity-reversing scattering amplitudes and of the total differential scattering cross section. We show, in particular, that for high frequencies (i.e., in the short-wavelength regime), a small number of Regge poles permits us to describe numerically with very good agreement the black-hole glory and the orbiting oscillations and we then provide a semiclassical approximation that unifies these two phenomena
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