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GR: Fachverband Gravitation und Relativitätstheorie

GR 17: Gravitational Waves II

GR 17.2: Vortrag

Donnerstag, 14. März 2024, 16:05–16:25, HBR 14: HS 2

Correlating Black Hole Recoils with Mode Asymmetries in Gravitational-Wave Radiation — •Jannik Mielke — Max-Planck-Institut für Gravitationsphysik (Albert-Einstein-Institut), Callinstraße 38, 30167 Hannover, Deutschland

Detections of gravitational waves from astrophysical sources such as binary black holes by LIGO and Virgo has attracted widespread attention from the scientific community, the media and the general public. Among these sources, precessing systems with a misalignment of the black hole spin and the orbital angular momentum are of particular interest because of the rich dynamics they offer. For aligned-spin systems, the energy and momentum emitted above the orbital plane is symmetric to the emission below the plane. For mis-aligned systems, however, this is not the case and amplitude and phase modulations will appear in the waveform itself. When the signal is decomposed into modes of spin-weighted spherical harmonics, we can discuss the asymmetry between the negative and positive m-modes by defining an anti-symmetric waveform, which is neglected in most waveform models used in gravitational wave data analysis to date. In this talk, we analyse the phenomenology of the anti-symmetric waveform and relate it to the physics of remnant black hole recoil, which is a consequence of asymmetric linear momentum radiation. Strong correlations were found between the intrinsic system parameters and the amplitude and phase of the anti-symmetric waveform, which in turn affects the magnitude of the out-of-plane recoil velocity.

Keywords: gravitational waves; precession; binary black holes; mode asymmetry; recoil