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The Enhanced Population of Extreme Mass-Ratio Inspirals in the LISA Band from Supermassive Black Hole Binaries

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arxiv 2307.11149 v2 pith:AHWRRNM5 submitted 2023-07-20 astro-ph.HE astro-ph.COastro-ph.GA

classification astro-ph.HEastro-ph.COastro-ph.GA
keywords lisasmbhblackemrisholerateabovebinary
verification ladder T0 review T1 audit T2 compute T3 formal

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Extreme mass ratio inspirals (EMRIs) take place when a stellar-mass black hole (BH) merges with a supermassive black hole (SMBH). The gravitational wave emission from such an event is expected to be detectable by the future Laser Interferometer Space Antenna (LISA) and other mHz detectors. It was recently suggested that the EMRI rate in SMBH binary systems is orders of magnitude higher than the EMRI rate around a single SMBH with the same total mass. Here we show that this high rate can produce thousands of SMBH-BH sources at a redshift of unity. We predict that LISA may detect a few hundred of these EMRIs with signal-to-noise ratio above SNR>=8 within a four-year mission lifetime. The remaining sub-threshold sources will contribute to a large confusion noise, which is approximately an order of magnitude above LISA's sensitivity level. Finally, we suggest that the individually detectable systems, as well as the background noise from the sub-threshold EMRIs, can be used to constrain the SMBH binary fraction in the low-redshift Universe.

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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. Flexible Spectral Separation of Multiple Isotropic and Anisotropic Stochastic Gravitational Wave Backgrounds in LISA

    astro-ph.IM 2025-08 conditional novelty 7.0 of 10

    BLIP 2.0 simultaneously infers multiple isotropic and anisotropic stochastic gravitational wave backgrounds in simulated LISA data, recovering the Milky Way, LMC, and stellar-origin black hole components and bounding ...

  2. Time-frequency Imprints of Extreme Mass-Ratio Inspirals in Confusion Gravitational Wave Background

    astro-ph.CO 2025-06 conditional novelty 7.0 of 10

    Correlations of time-frequency spectra can measure EMRI population parameters to a few percent accuracy even when the EMRI gravitational wave background is two orders of magnitude weaker than the white dwarf foreground.

  3. Localizing Dynamically-Formed Black Hole Binaries in Milky Way Globular Clusters with LISA

    astro-ph.HE 2025-01 conditional novelty 6.0 of 10

    LISA should detect about 2 (SNR>5) black hole binaries from Milky Way globular clusters in 10 years, mostly eccentric, with the strongest sources localizable to a specific cluster at roughly 1 deg^2.

  4. Towards a Non-singular Paradigm of Black Hole Physics

    gr-qc 2025-01 unverdicted novelty 1.0 of 10

    This is a review built around a week-long workshop, synthesizing the state and open problems of regular black holes and black hole mimickers as alternatives to singular black holes.

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