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Can we assume that most (if not all) black holes are rotating, due to conservation of momentum?

I am excluding the micro world from this question, just thinking of the range of stars on the main sequence of the H-R diagram as they shrink over time.

Can anyone give me an example of non-rotating macro sized B.H., e.g a binary system where each star counter-rotates relative to the other and explain how they may, (if they can) at least slow down each others's rotational velocity?

Qmechanic
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1 Answers1

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Yes, we expect all astrophysical black holes to have nonzero rotation. If nothing else, a rotating black hole that absorbs even a single particle with net angular momentum will then have nonzero angular momentum.

Zo the Relativist
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