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What are the experimental (indirect) evidence for the cosmic neutrino background? Where can I read more about this?

The discussion on the wikipedia page about the C$\nu$B seems to me to be more about the evidence of the number of generation of neutrinos, than about the cosmic neutrino background...

Anne O'Nyme
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We have, at this time, no tools capable of detecting neutrinos at the very low energies of the cosmic neutrino background, and if such tools existed they would have to contend with numerous backgrounds making the experiment ferociously difficult.

dmckee --- ex-moderator kitten
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