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Rodriguez, Carl L.; Amaro-Seoane, Pau; Chatterjee, Sourav; Kremer, Kyle; Rasio, Frederic A.; Samsing, Johan; Ye, Claire S.; Zevin, Michael
Physical review. D, 12/2018, Volume: 98, Issue: 12Journal Article
Using state-of-the-art dynamical simulations of globular clusters, including radiation reaction during black hole encounters and a cosmological model of star cluster formation, we create a realistic population of dynamically formed binary black hole mergers across cosmic space and time. We show that in the local universe, 10% of these binaries form as the result of gravitational-wave emission between unbound black holes during chaotic resonant encounters, with roughly half of those events having eccentricities detectable by current ground-based gravitational-wave detectors. The mergers that occur inside clusters typically have lower masses than binaries that were ejected from the cluster many Gyrs ago. Gravitational-wave captures from globular clusters contribute 1 – 2 Gpc−3 yr−1 to the binary merger rate in the local universe, increasing to ≳ 10 Gpc−3 yr−1 at z ∼ 3 . Finally, we discuss some of the technical difficulties associated with post-Newtonian scattering encounters, and how care must be taken when measuring the binary parameters during a dynamical capture.
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