Orbital eccentricities in primordial black hole binaries

  title={Orbital eccentricities in primordial black hole binaries},
  author={Ilias Cholis and Ely D. Kovetz and Yacine Ali-Haimoud and Simeon Bird and Marc Kamionkowski and Julian B. Mu{\~n}oz and Alvise Raccanelli},
  journal={Physical Review D},
It was recently suggested that the merger of $\ensuremath{\sim}30\text{ }\text{ }{M}_{\ensuremath{\bigodot}}$ primordial black holes (PBHs) may provide a significant number of events in gravitational-wave observatories over the next decade, if they make up an appreciable fraction of the dark matter. Here we show that measurement of the eccentricities of the inspiralling binary black holes can be used to distinguish these binaries from those produced by more traditional astrophysical mechanisms… 

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