Moduli Effects on Neutrino Oscillations

We point out the possibility to detect the low-energy signals of moduli in the superstring theory through the neutrino oscillation. The idea is based on the characteristics that the couplings of moduli are different from matter to matter. We estimate the oscillation probability both in the baseline and solar neutrino oscillations. In both cases, when there is at least one modulus of which mass is less than or equal to $10^{-19}$ GeV, the interaction of the modulus significantly changes the conversion probability from one neutrino flavor to another.