A nice summary of the state of the art in indirect detection of cosmic background neutrinos by StartsWithABang (npub1hh3…hqxd) (https://bigthink.com/starts-with-a-bang/big-bangs-final-prediction/), a useful supplement to a recent discussion on [@dandkuniverse.bsky.social](https://bsky.brid.gy/r/https://bsky.app/profile/dandkuniverse.bsky.social )
In my SF story “Didicosm” the protagonist used indirect neutrino evidence to learn about the precise geometry of the universe:
https://www.gregegan.net/DIDICOSM/Complete/Didicosm.html
