Geometric Prediction of Neutrino Masses and Mixings from Moduli Stabilization in Type IIB String Theory

Neutrino masses and mixings are derived from a stabilized vacuum geometry in Type IIB string theory. The same fixed-point moduli values that determine vacuum energy and charged fermion hierarchies are shown to predict a realistic neutrino spectrum without additional continuous parameters. Hierarchies arise from the ratio of stabilized Kähler moduli (approximately 0.056), while exponential localization effects are governed by a complex structure modulus with suppression exponent 2.85. The resulting Yukawa texture yields a normal mass ordering with individual masses of approximately 2, 9, and 49 meV, a total mass sum of approximately 0.060 eV, and PMNS mixing angles in agreement with global fits. The predicted neutrinoless double beta decay parameter is approximately 1.3 meV, well below current experimental sensitivity. The texture does not support inverted ordering, providing a falsifiable experimental target.