No evidence for core-collapse formed low-spin IMBHs in GWTC-4, with 90% upper limit on merger rate of 0.077 Gpc^{-3} yr^{-1}, low-spin BH mass truncation at 65 solar masses consistent with pair-instability gap lower edge, and high-spin IMBHs from hierarchical mergers.
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Unresolved compact binary coalescence background acts as additional noise that worsens Frequency-Hough sensitivity for continuous gravitational waves by 7-10% near 7 Hz under Einstein Telescope conditions.
citing papers explorer
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How do the LIGO-Virgo-KAGRA's Heavy Black Holes Form? No evidence for core-collapse Intermediate-mass black holes in GWTC-4
No evidence for core-collapse formed low-spin IMBHs in GWTC-4, with 90% upper limit on merger rate of 0.077 Gpc^{-3} yr^{-1}, low-spin BH mass truncation at 65 solar masses consistent with pair-instability gap lower edge, and high-spin IMBHs from hierarchical mergers.
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Impact of coalescence signals on the search for continuous gravitational waves with Einstein Telescope
Unresolved compact binary coalescence background acts as additional noise that worsens Frequency-Hough sensitivity for continuous gravitational waves by 7-10% near 7 Hz under Einstein Telescope conditions.