28,953 research outputs found
Fermion masses and mixings from heterotic orbifold models
We search for a possibility of getting realistic fermion mass ratios and
mixing angles from renormalizable couplings on the Z_6-I heterotic orbifold
with one pair of Higgs doublets. In the quark sector, we find cases with
reasonable m_c/m_t, m_s/m_b, and V_{cb}, if we ignore the first family. In the
lepton sector, we can fit the charged lepton mass ratios, the neutrino mass
squared difference ratio, and the lepton mixing angles, considering all three
families.Comment: 4 pages, 2 figures, 5 tables; talk presented at PASCOS-05, Gyeongju,
May 30-Jun 4, 2005; to appear in the proceeding
Universal Bundle, Generalized Russian Formula and Non-Abelian Anomaly in Topological Yang-Mills Theory
We re-examine the geometry and algebraic structure of BRST's of Topological
Yang-Mills theory based on the universal bundle formalism of Atiyah and Singer.
This enables us to find a natural generalization of the {\it Russian formula
and descent equations\/}, which can be used as algebraic method to find the
non-Abelian anomalies counterparts in Topological Yang-Mills theory. We suggest
that the presence of the non-Abelian anomaly obstructs the proper definition of
Donaldson's invariants.Comment: 16 pages, harvmac TeX, ESENAT-92-07, (TeXnical and stupid errors are
corrected.
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