[falseprofit]

Not a physicist, but here are a couple Wikipedia excerpts I found: From page “Conservation of mass”:

“In general, mass is not conserved. The conservation of mass is a law that holds only in the classical limit.”

From page “Neutrino oscillation”:

“Neutrino oscillation arises from mixing between the flavor and mass eigenstates of neutrinos. That is, the three neutrino states that interact with the charged leptons in weak interactions are each a different superposition of the three (propagating) neutrino states of definite mass. Neutrinos are produced and detected in weak interactions as flavour eigenstates[a] but propagate as coherent superpositions of mass eigenstates.[23]”

[cobbzilla]

so it’s changing mass/energy with itself? and the whole thing says constant? I guess that makes sense.

[falseprofit]

Maybe it isn’t changing mass at all, and what’s changing is just the probability distribution resulting from a hypothetical flavor measurement. If we could measure the mass (collapse to mass eigenstate), I think I understand we would see no oscillation.