Could LIGO's black holes be primordial and what is an easy way to figure that out?

@misc{ pirsa_PIRSA:17110079,
  doi = {10.48660/17110079},
  url = {https://pirsa.org/17110079},
  author = {},
  keywords = {Quantum Gravity},
  language = {en},
  title = {Could LIGO{\textquoteright}s black holes be primordial and what is an easy way to figure that out?},
  publisher = {Perimeter Institute},
  year = {2017},
  month = {nov},
  note = {PIRSA:17110079 see, \url{https://pirsa.org}}
}