Non-Perturbative Properties of Heterotic String Vacua Compactified on $K3\times T^2$

Abstract

Using the heterotic--type II duality of $N=2$ string vacua in four space-time dimensions we study non-perturbative couplings of toroidally compactified six-dimensional heterotic vacua. In particular, the heterotic--heterotic $S$-duality and the Coulomb branch of tensor multiplets observed in six dimensions are studied from a four-dimensional point of view. We explicitly compute the couplings of the vector multiplets of several type II vacua and investigate the implications for their heterotic duals.

arXiv comment39 pages, harvmac, 4 figures, minor changes, version to appear in Nucl.Phys.B

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• Jacobi Forms of Higher Index and Paramodular Groups in N=2, D=4 Compactifications of String Theory
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