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Is it even possible for a black hole (or any stellar body) to form without angular momentum? Or somehow consume all of its angular momentum without decomposing?
by eyegor 5y ago
Is it even possible for a black hole (or any stellar body) to form without angular momentum? Or somehow consume all of its angular momentum without decomposing? I know that it's used in some bits of general relativity around the schwarzchild solution but I've never seen an attempt to prove that they could ever form in the first place. I'd appreciate links to research papers if you know of any.
- mr_toad 5y agoOnly if the matter that comprised it had zero net angular momentum before hand. Angular momentum is conserved. It’s totally possible in theory for a black hole to have zero angular momentum, but not so likely in practice.
- eyegor 5y agoOh of course, it's just a sum after all. Reminds me of forgetting the zero roots when solving differential equations.
- pdonis 5y ago> Is it even possible for a black hole (or any stellar body) to form without angular momentum? In principle, yes. In fact, one of the earliest papers on black holes was the one by Oppenheimer and Snyder in 1939 that derived an explicit solution for the case of perfectly spherically symmetrical (i.e., exactly zero angular momentum) collapse to a black hole. In practice, any blob of matter is most likely going to have some angular momentum, and it's unlikely that it will shed all of it if it collapses to a black hole, so we would expect black holes without any angular momentum at all to be rare. But there could be significant numbers of them that have small angular momentum compared to their mass.
- candiodari 5y agoBlack hole formation will massively accelerate rotation for the same reason ice skaters rotate faster when drawing their arms closer. If the origin star had a tiny rotation the black hole will be incredibly smaller, and incredibly faster rotation.