Black-hole mergers in disklike environments could explain the observed q -\ensuremathχ$_{eff}$ correlation. Santini, A., Gerosa, D., Cotesta, R., & Berti, E. Physical Review D, 108(8):083033, October, 2023.
doi  bibtex   
@ARTICLE{2023PhRvD.108h3033S,
       author = {{Santini}, Alessandro and {Gerosa}, Davide and {Cotesta}, Roberto and {Berti}, Emanuele},
        title = "{Black-hole mergers in disklike environments could explain the observed q -{\ensuremath{\chi}}$_{eff}$ correlation}",
      journal = {Physical Review D},
     keywords = {Astrophysics - High Energy Astrophysical Phenomena, Astrophysics - Cosmology and Nongalactic Astrophysics, Astrophysics - Astrophysics of Galaxies, General Relativity and Quantum Cosmology},
         year = 2023,
        month = oct,
       volume = {108},
       number = {8},
          eid = {083033},
        pages = {083033},
          doi = {10.1103/PhysRevD.108.083033},
archivePrefix = {arXiv},
       eprint = {2308.12998},
 primaryClass = {astro-ph.HE},
       adsurl = {https://ui.adsabs.harvard.edu/abs/2023PhRvD.108h3033S},
      adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}

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