Ha ha. In this explanation of a paper that Sabine Hossenfelder seems pretty excited about, regarding whether or not black holes have to have a singularity at their centre, there's a diagram showing a "ring singularity".
I'm soon off to my own Ring singularity - Götterdämmerung - starting at 4pm, and ending at 10.40pm. Yes, seeing all of a Ring Cycle takes some commitment.
One minor point that I hadn't realised before - that Kerr of rotating black hole fame is a New Zealander - and still at the University of Canterbury in Christchurch. Huh. I would have assumed he was from a famous British or US university.
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