Large neutrino mixing is not fixed by the seesaw mechanism's mass eigenvalues, so it must arise from additional flavor structure, and the inverse seesaw needs a fine-tuned cancellation.
µ → eγ at a rate of one out of 10 9 muon decays?,
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Emergent large flavor mixing from canonical and inverse seesaws?
Large neutrino mixing is not fixed by the seesaw mechanism's mass eigenvalues, so it must arise from additional flavor structure, and the inverse seesaw needs a fine-tuned cancellation.