A new model emphasizing secondary mass features and pairing transitions improves spectral siren H0 constraints by ~30% using 142 GW events from GWTC-4.0.
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Models BBH spin-orbit alignment as random walk on sphere, deriving exact distribution after n encounters and showing alignment survives several strong encounters before isotropy.
BBH-Genesis applied to GWTC-4 finds strongest support for a two-channel model of binary black hole populations with possible mild evidence for an AGN-related third channel.
GWTC-5.0 analysis of 267 events gives BBH merger rate 27.5-49.4 Gpc^{-3} yr^{-1} at z=0.2, evidence for hierarchical-merger subpopulation at two mass scales, mass-spectrum features at 10 and 35 solar masses, and asymmetric effective-spin distribution implying at least 9% aligned channels.
A stripped-star-motivated five-component model for binary black hole populations is preferred over the LVK baseline by a log10 Bayes factor of 7.69 and attributes the observed mass features to isolated, dynamical, and hierarchical formation channels.
Updated ANC constraints on the 12C(alpha,gamma)16O S-factor favor lower values than prior evaluations and imply a black-hole mass-gap lower edge of 61-75 solar masses.
Slowly rotating 80-85 solar mass Pop III stars form black holes of similar mass with dimensionless spins up to 0.7, just below the pair-instability gap.
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Secondary-Mass Features improve Spectral-Siren $H_0$ Constraints
A new model emphasizing secondary mass features and pairing transitions improves spectral siren H0 constraints by ~30% using 142 GW events from GWTC-4.0.