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If you mean the world lines of infalling dust particles on that Penrose diagram, I’m not sure; I don’t know exactly what coordinate system is used there.
BTW, this other page I wrote on things falling into black holes might also be of interest:
https://www.gregegan.net/SCIENCE/FiniteFall/FiniteFall.html
Greg Egan /
npub1qq…j5nhv
2024-11-24 13:56:55
in reply to nevent1q…dcj4
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wss://relay.nostr.bandPublished at
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