Abstract
Symmetry groups on the space of (2,2) string vacua for c = 3,6,9 are discussed in the context of orbifoldized Landau-Ginzburg theories. A general method for finding the maximal symmetry groups on the moduli space of untwisted marginal operators is presented, by studying symmetries on the resolution of isolated singularities of superpotentials. Stabilizing subgroups of such symmetry groups are shown to correspond with automorphism groups of Calabi-Yau manifolds. In addition to our earlier work on this subject we present some new examples for c = 9 (2,2) vacua. Susbsequently we discuss modular transformations that relate small volume target-spaces to large ones. 54 refs., 3 tabs.
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