Neutrino oscillations and Lorentz invariance breakdown

The breakdown of Lorentzʹs and CPT invariance gives rise to the occurrence of helicity terms in the dispersion relation of fermions. Consequences of these terms are reviewed in the framework of spin flavor oscillations of neutrinos, and resonance effects are discussed. Bounds on the 0-component of the pseudo-vector potential bμ are derived for solar and atmospheric neutrinos.