Black-hole mergers in disklike environments could explain the observed - correlation
arXiv:2308.12998 · doi:10.1103/PhysRevD.108.083033
Abstract
Current gravitational-wave data from stellar-mass black-hole binary mergers suggest a correlation between the binary mass ratio and the effective spin : more unequal-mass binaries consistently show larger and positive values of the effective spin. Multiple generations of black-hole mergers in dense astrophysical environments may provide a way to form unequal-mass systems, but they cannot explain the observed correlation on their own. We show that the symmetry of the astrophysical environment is a crucial feature to shed light on this otherwise puzzling piece of observational evidence. We present a toy model that reproduces, at least qualitatively, the observed correlation. The model relies on axisymmetric, disk-like environments where binaries participating in hierarchical mergers share a preferential direction. Migration traps in AGN disks are a prime candidate for this setup, hinting at the exciting possibility of constraining their occurrence with gravitational-wave data.
arXiv comment9 pages, 4 figures. Published in PRD
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