Massive neutrinos are eigenstates of vacuum Hamiltonian. So any flavour can be expressed as a superposition of these states, and typical considerations of a 2-state system follow. What happens if neutrinos interact with matter and acquires an interaction energy? How to express the perturbation Hamiltonian and proceed?
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1$\begingroup$ This is called "MSW Effect" and has been worked out in textbook chapters with that name $\endgroup$– rflCommented Oct 1, 2021 at 16:36
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$\begingroup$ @rfl Could you refer to any relevant resource? $\endgroup$– Snpr_PhysicsCommented Oct 1, 2021 at 16:49
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$\begingroup$ en.wikipedia.org/wiki/… $\endgroup$– rflCommented Oct 1, 2021 at 17:53
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