Upper limits on the isotropic gravitational-wave background from the first part of LIGO, Virgo, and KAGRA’s fourth observing run

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Analysis reveals no significant isotropic gravitational-wave background, suggesting binary black holes may contribute to cosmic time models.

Analysis found no significant background signal, indicating constraints on isotropic gravitational-wave sources.
New limits on the isotropic gravitational-wave background yield a 1.7 improvement in sensitivity for compact binary coalescences.
Cross-correlation analysis across Advanced LIGO and Virgo data provides insights into binary black hole merger rates.
Findings suggest the estimated total background is nearing detectability, emphasizing implications for gravitational-wave astronomy.

NULL AUTHOR_ID (2025) studied this question.

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Analysis reveals no significant isotropic gravitational-wave background, suggesting binary black holes may contribute to cosmic time models.