With fiducial feedback-regulated accretion, in-situ light seed black holes in nuclear star clusters grow only to ~400–500 solar masses; runaway growth to ~10^6 solar masses requires an unrealistically high Bondi capture fraction.
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The In Situ Growth of Stellar-mass "Light" Seed Black Holes in Nuclear Star Clusters
With fiducial feedback-regulated accretion, in-situ light seed black holes in nuclear star clusters grow only to ~400–500 solar masses; runaway growth to ~10^6 solar masses requires an unrealistically high Bondi capture fraction.