Majorana neutrino mass structure induced by rigid instatons on toroidal orbifold

Tatsuo Kobayashi , Yoshiyuki Tatsuta , Shohei Uemura

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classification ✦ hep-ph hep-th

keywords rigidd-braneinducedinstantonsmajoranamassmixingbimaximal

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We study effects of D-brane instantons wrapping rigid cycles on Z2*Z2' toroidal orbifold. We compute Majorana masses induced by rigid D-brane instantons and realize bimaximal mixing matrices in certain models. We can also derive more generic mass matrices in other models. The bimaximal mixing Majorana mass matrix has a possibility to explain observed mixing angles. We also compute the mu-term matrix among more than one pairs of Higgs fields induced by rigid D-brane instantons.

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Massive modes on magnetized blow-up manifold of $T^2/\mathbb{Z}_N$
hep-th 2026-04 unverdicted novelty 5.0

Blow-up of magnetized T²/Z_N preserves total magnetic flux, total curvature, and effective flux on connecting lines, while the number of localized modes at each singularity increases by one per mass level increment.