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Gravitational waves from b-EMRIs: Doppler shift and beaming, resonant excitation, helicity oscillations and self-lensing

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arxiv 2506.14868 v2 pith:BCGMD37Q submitted 2025-06-17 gr-qc astro-ph.HEphysics.class-ph

classification gr-qcastro-ph.HEphysics.class-ph
keywords gravitationalbinarywavesblackholestellar-massbeamingcapture
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We study gravitational waves from a stellar-mass binary orbiting a spinning supermassive black hole, a system referred to as a binary extreme mass ratio inspiral (b-EMRI). We use Dixon's formalism to describe the stellar-mass binary as a particle with internal structure, and keep terms up to quadrupole order to capture the generation of gravitational waves by the inner motion of the stellar-mass binary. The problem of emission and propagation of waves is treated from first principles using black hole perturbation theory. In the gravitational waveform at future null infinity, we identify for the first time Doppler shifts and beaming due to the motion of the center of mass, as well as helicity breaking gravitational lensing, and resonances with ringdown modes of the supermassive black hole. We establish that previously proposed phenomenological models inadequately capture these effects.

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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. Periodic line-of-sight velocity-driven modulations to gravitational waves emitted by compact binaries in Keplerian outer orbits

    gr-qc 2026-07 conditional novelty 7.0 of 10

    Periodic non-relativistic line-of-sight velocity of a compact binary’s centre of mass produces 4PN phase and amplitude modulations that improve Fisher forecasts of tertiary mass and outer-orbit size for A+, ET, DECIGO...

  2. Ringdown and lensing of triple systems

    gr-qc 2026-05 unverdicted novelty 6.0 of 10

    Numerical relativity simulations of triple black hole systems reveal redshift effects and gravitational lensing in ringdown signals from head-on mergers, with no additional black hole formation from amplified waves.

  3. Observable signature of magnetic tidal coupling in hierarchical triple systems

    gr-qc 2025-10 conditional novelty 6.0 of 10

    Magnetic tidal fields from a supermassive black hole trigger new orbital resonances in a companion compact binary, boosting eccentricity and altering its gravitational-wave signal.

  4. Self-lensing of moving gravitational-wave sources can break the microlensing crossing timescale degeneracy

    astro-ph.HE 2025-12 conditional novelty 5.0 of 10

    Self-lensing of a moving GW chirp by an orbiting black hole yields a curve width and interference beats that together give the orbital distance and the black hole mass.

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