Abstract
We present a ‘‘gravity‐induced’’ seesaw mechanism, which accommodates neutrino masses (mν∝m2u/MI, with mu the corresponding quark mass and MI≂4×1011 GeV) compatible with the MSW study of the Solar neutrino deficit within the minimal supersymmetric Standard Model (the grand desert with the gauge coupling unification at MU≂2×1016 GeV). We show that for large radius (R2/α’=O(20)) Calabi‐Yau spaces, threshold corrections ensure M2U=M2C/O(2R2/α’) and the magnitude of the non‐renormalizable terms in the superpotential yields MI=O(e−R2/α’)MC. Here MC=g×5.2×1017 GeV is the scale of the tree level (genus zero) gauge coupling (g) unification.
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