Three Pathways for Merging Black Holes Revealed by GWTC-4
A new GWTC-4 catalog from the LIGO-Virgo-KAGRA collaboration doubles the count of gravitational-wave detections and shows merging binary black holes split into three subpopulations with distinct masses, spins, and merger rates. The study suggests multiple origins for these mergers—from isolated binary evolution to hierarchical, recycled mergers—producing unusually heavy and fast-spinning systems and reshaping our understanding of black hole formation and their cosmic origins.
