Moduli space of Chaudhuri-Hockney-Lykken strings

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Abstract
We discuss an orbifold of the toroidally compactified heterotic string which gives a global reduction of the dimension of the moduli space while preserving the supersymmetry. This construction yields the moduli space of the first of a series of reduced rank theories with maximal supersymmetry discovered recently by Chaudhuri, Hockney, and Lykken. Such moduli spaces contain nonsimply laced enhanced symmetry points in any spacetime dimension DD=4 the set of allowed gauge groups is invariant under electric-magnetic duality, providing further evidence for the S duality of the D=4 heterotic string. © 1995 The American Physical Society.