An anomaly-free model in six dimensions
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We show that a gauged supergravity theory based on E6 E7 U(1) is free of gauge and gravitational anomalies in six dimensions. It compactifies to (Minkowski)4 S2 by the standard monopole mechanism. With a monopole of strength n in E6, the resulting four-dimensional theory exhibits chiral SO(10) U(1) with 2|n| families (and no antifamilies). Supersymmetry is broken. 1985.