In GWTC-4, only the subpopulation near 35 M_sun is equal-mass, low-spin, and randomly oriented, matching globular-cluster dynamical formation with BH birth spins 0.1-0.2.
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Characterizing Binary Black Hole Subpopulations in GWTC-4 with Binned Gaussian Processes: On the Origins of the $35M_{\odot}$ Peak
In GWTC-4, only the subpopulation near 35 M_sun is equal-mass, low-spin, and randomly oriented, matching globular-cluster dynamical formation with BH birth spins 0.1-0.2.