Abstract
We discuss a string-inspired scheme in which an extremely light (or a strictly massless) scalar particle, coupled very weakly to both neutrinos and to a constituent of the matter, gives rise to neutrino masses within a medium. We also discuss how exotic properties of neutrinos such as possible violations of the equivalence principle may produce neutrino oscillations in such a scheme. The identification of the scalar with Quintessence is possible if one could avoid a moderate fine-tuning present here as a constraint on the scalar-neutrino coupling constant from Quintessential cosmology.
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