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We perform a hierarchical Bayesian analysis of the GWTC-2 catalog toinvestigate the mixed scenario in which the merger events are explained byblack holes of both astrophysical and primordial origin. For the astrophysicalscenario we adopt the phenomenological model used by the LIGO/Virgocollaboration and we include the correlation between different parametersinferred from data, the role of the spins in both the primordial andastrophysical scenarios, and the impact of accretion in the primordialscenario. Our best-fit mixed model has a strong statistical evidence relativeto the single-population astrophysical model, thus supporting the coexistenceof populations of black-hole mergers of two different origins. In particular,our results indicate that the astrophysical mergers account for roughly fourtimes the number of primordial black hole events and predict thatthird-generation detectors, such as the Einstein Telescope and Cosmic Explorer,should detect up to hundreds of mergers from primordial black hole binaries atredshift $z\gtrsim30$.

Bayesian Evidence for Both Astrophysical and Primordial Black Holes: Mapping the GWTC-2 Catalog to Third-Generation Detectors