GWTC-5 population analysis finds high-spin black hole mass function traces low-spin remnant distribution with Bhattacharyya coefficient ~0.95, supporting hierarchical mergers and yielding a nuclear S-factor constraint.
K.et al.Observing Intermediate-mass Black Holes and the Upper Stellar-mass gap with LIGO and Virgo.Astrophys
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Smoking-gun evidence for hierarchical black-hole mergers
GWTC-5 population analysis finds high-spin black hole mass function traces low-spin remnant distribution with Bhattacharyya coefficient ~0.95, supporting hierarchical mergers and yielding a nuclear S-factor constraint.