Tuesday, 9 July 2019

general relativity - Do all "normal" black holes rotate?



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?



Answer



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.


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