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The stochastic gravitational wave background from close hyperbolic encounters of primordial black holes in dense clusters

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arxiv 2109.11376 v2 pith:FMWMP5VV submitted 2021-09-23 gr-qc astro-ph.CO

Juan García-Bellido , Santiago Jaraba , Sachiko Kuroyanagi This is my paper · ORCID
classification gr-qcastro-ph.CO
keywords blackprimordialbackgroundcloseclustersdenseencountersevent
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The inner part of dense clusters of primordial black holes is an active environment where multiple scattering processes take place. Some of them give rise from time to time to bounded pairs, and the rest ends up with a single scattering event. The former eventually evolves to a binary black hole (BBH) emitting periodic gravitational waves (GWs), while the latter with a short distance, called close hyperbolic encounters (CHE), emits a strong GW burst. We make the first calculation of the stochastic GW background originating from unresolved CHE sources. Unlike the case for BBH, the low-frequency tail of the SGWB from CHE is sensitive to the redshift dependence of the event rate, which could help distinguish the astrophysical from the primordial black hole contributions. We find that there is a chance that CHE can be tested by third-generation ground-based GW detectors such as Einstein Telescope and Cosmic Explorer.

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Cited by 4 Pith papers

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

  1. Gravitational Waves From Dark Binaries With Finite-Range Dark Forces

    gr-qc 2024-12 conditional novelty 7.0 of 10

    A finite-range dark force between dark-matter binaries sharpens and enhances the predicted gravitational wave background, adding knee features tied to the mediator mass.

  2. Spin-up and mass-gain in hyperbolic encounters of spinning black holes

    gr-qc 2025-10 unverdicted novelty 6.0 of 10

    Scattering black holes gain spin and mass by absorbing emitted gravitational radiation, with spin-up up to 0.3 and mass gain up to 15% in near-threshold encounters.

  3. Parameter estimation of gravitational waves from hyperbolic black hole encounters

    gr-qc 2025-07 conditional novelty 6.0 of 10

    RIFT can recover the masses, spins, and orbital energy and angular momentum of simulated hyperbolic black hole encounters when paired with the TEOBResumSDALI waveform model.

  4. Scalar kicks and memory

    gr-qc 2024-12 conditional novelty 6.0 of 10

    For hyperbolic binaries, a conformally coupled scalar changes the memory and zero-frequency power while a disformally coupled scalar changes only the center-of-mass kick.

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