We present the exact formula for neutrino oscillations. By resorting to
recent results of Quantum Field Theory of fermion mixing, we work out the
Green's function formalism for mixed neutrinos. The usual quantum mechanical
Pontecorvo formula is recovered in the relativistic limit.Comment: 7 pages, RevTeX, revised version: title changed and some minor
change
We consider the quantum field theoretical formulation of boson field mixing and obtain the exact oscillation formula. This formula does not depend on arbitrary mass parameters. We show that the space for the mixed field states is unitarily inequivalent to the state space where the unmixed field operators are defined. We also study the structure of the currents and charges for the mixed fields.
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