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In introductory mechanics, the momentum of a particle is its mass times its velocity. In electrodynamics, the momentum of a field is proportional to the cross-product of the electric field with the magnetic field. In special relativity, momentum is generalized to four-momentum.

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Why neutrino's mass states are assumed to share the same momentum?

In derivation of two-neutrino oscillation probability, it was assumed that the mass states have the same momentum. Why is that? Source: https://www.youtube.com/watch? …
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