I really enjoyed this essay. I'm just a cosmology bystander/hobbyist, but your takedown of the dark matter hypotheses was very appealing to me. I was shocked when I got to the section where you talk about all these macro-scale simulations using only dark matter. It's like an ouroboros of cosmological theories eating themselves, totally disconnected from reality. And relates to one of my favorite quotes that "simulations are doomed to succeed". I don't understand physics well enough to really understand black hole jets, but it feels like an elegant theory and I hope you're able to take it somewhere.

This was my first time hearing about the idea of universes producing children inside of black holes that may have slightly different physical properties. This is also really cool and interesting, but clearly a different level of theoretical compared to your first half about the black hole jets. I haven't had time to delve into any of your links, but it seems like you skipped over explaining how a universe would form inside a black hole in the first place. I saw in the comments on substack that someone pointed out the concept of "black hole electrons" and it's like, yeah, if we don't know what's going on inside black holes, then why couldn't they be their own universes? And if that's the case for black holes, then why not also electrons, or protons, or any other sufficiently dense and mysterious object? But then again why would we suppose that another universe would necessarily form inside those things? I'm curious if you could expand on what you think the mechanism would be for universe formation, as well as what you think the mechanism would be for variation/heredity in the child universes.