• The Schwarzchild radius is the radius to the event horizon, which increases with mass. The singularity (if it exists) has no size exactly- it's infinitely small and dense.

    (This is just what GR equations say, we obviously don't and probably cannot ever know what's really beyond the event horizon. I would guess most physicists probably think you can't have infinities in physical quantities i.e. no singularity.)

    I barely studied GR and certainly not white holes I'm afraid so not much help here. Dark matter is just matter that we can't currently detect so probably fair to assume it acts in the same way as everything else does. I had a read of the Wikipedia page on white holes and couldn't figure out whether or not mass/energy would pass straight through or get mashed. Probably safest to assume everything gets mashed with a singularity but you could instead go for the Einstein-Rosen bridge thing which (I think) doesn't have a singularity, just a nice smooth "tube" in spacetime connecting two bits together, as opposed to the infinite spike of a singularity.

    Has it been written about? - not sure but I have an extremely vague memory of reading someone's idea (could be a book, comment, tweet, no idea) that Bad Guys created black holes so they could steal our matter because they didn't have any. Like after heat death or something.

  • Thanks for replying, that’s very helpful.

    Einstein-Rosen bridge thing which (I think) doesn't have a singularity, just a nice smooth "tube" in spacetime

    This might work, I’ll do more research, thanks for suggesting it.

    Bad Guys created black holes so they could steal our matter

    Good to know the idea is out there. I’d love to create some deja entendu but haven’t found any other source material to build on.

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