Constraints on the environment dependence of the neutrino mass from solar and reactor neutrino data

We investigate what can be the role of Mass Varying Neutrinos in several different neutrino oscillation experiments, in particular focusing on the relation between KamLAND data and solar neutrino experiment results. Assuming that the adiabaticity of solar neutrinos evolution in LMA-MSW scenario is not broken by the inclusion of this new mechanism, we can establish new limits on MaVaN's parameters by fitting together KamLAND and solar neutrinos data. We also investigate the role of how non-adiabatic effects in the Sun can change this scenario, allowing a larger value of these parameters. (author)