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Is it related to the way they deduce the Hubble constant from Planck data?

Would more types of oscillating and mixing neutrinos mean faster or slower expansion of the universe?

Would a fourth mass eigenstate necessarily be heavier than the three we already know about? Would it have caused earlier 'decoupling' from everything else?

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    $\begingroup$ Not 100% sure here so I’m not gonna post this as an answer, but I believe I’ve heard that sometimes neutrino rates can be approximated by otherwise unexplained energy/ momentum loss that comes from neutrino producing events. Also you have quite a few questions here, maybe try narrowing it down a bit and making multiple posts. $\endgroup$
    – Justin T
    Nov 3, 2021 at 19:47

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