On the hunt for ‘hierarchical’ black holes

ScienceDaily | Jul 27, 2021 at 7:18 PM
  • In a review paper, published in Nature Astronomy, Dr Davide Gerosa, of the University of Birmingham, and Dr Maya Fishbach of Northwestern University, suggest that recent theoretical findings together with astrophysical modelling and recorded gravitational wave data will enable scientists to accurately interpret gravitational wave signals from these events.
  • There is now fervent activity to prove the existence of so-called ‘hierarchical mergers’ although the detection of GW190521 in 2019 — the most massive black hole merger yet detected — is thought to be the most promising candidate so far.
  • This must be an environment with a large number of black holes, and one that is sufficiently dense to retain the black holes after they have merged, so they can go on and merge again.