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Yep. If they existed I think I read that they would be small & dense (tight orbits around the MBH) and dim. (Before collapse, obviously).
Tough to find, hence intriguingly interesting.
The thing is though, LISA might detect things like this if they generate gravity waves.
There could also be lots to learn from wave interference patterns etc around BHs.
Oh well, HCSS ? Just another theoretical prediction .... maybe someday ..
Cheers
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