Abstract
An SO(10) GUT model with realistic left-handed chiral 16 fermions is obtained from the D = 6, N = 2 supergravity with matter and gauge couplings on the scalar coset E 7 / SO(12) × Sp(1). The six dimensions compactify into (four-dimensional Minkowski space-time)×(two sphere S 2) by a monopole on S 2 without any fine-tuning for the four-dimensional cosomological constant. The monopole charge n (when positive) directly gives the number of generations of quarks and leptons.
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