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Implications for the Supermassive Black Hole Binaries from the NANOGrav 15-year Data Set

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arxiv 2307.00722 v2 pith:LYIN6SHR submitted 2023-07-03 astro-ph.CO gr-qchep-ph

classification astro-ph.COgr-qchep-ph
keywords smbhbsdatananogravbinariesblackholesupermassiveyear
verification ladder T0 review T1 audit T2 compute T3 formal
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NANOGrav, EPTA, PPTA, and CPTA have announced the evidence for a stochastic signal from their latest data sets. Supermassive black hole binaries (SMBHBs) are supposed to be the most promising gravitational-wave (GW) sources of pulsar timing arrays. Assuming an astro-informed formation model, we use the NANOGrav 15-year data set to constrain the gravitational wave background (GWB) from SMBHBs. Our results prefer a large turn-over eccentricity of the SMBHB orbit when GWs begin to dominate the SMBHBs evolution. Furthermore, the GWB spectrum is extrapolated to the space-borne GW detector frequency band by including inspiral-merge-cutoff phases of SMBHBs and should be detected by LISA, Taiji and TianQin in the near future.

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Cited by 2 Pith papers

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  1. Analytic Gravitational Wave Spectrum in Next-to-Minimal Bouncing Cosmology

    astro-ph.CO 2025-07 conditional novelty 6.0 of 10

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    astro-ph.CO 2025-05 conditional novelty 4.0 of 10

    The paper forecasts that resonant-cavity and superconducting-circuit gravitational wave detectors could constrain the bounce energy scale of a generic bouncing cosmology far more tightly than astrophysical observatori...

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