Perturbative gravitational couplings and Siegel modular forms in $D=4,N=2$ string models

Abstract

We consider four-parameter $D=4,N=2$ string models with Hodge numbers $(4,214-12n)$ and $(4,148)$, and we express their perturbative Wilsonian gravitational coupling $F_1$ in terms of Siegel modular forms.

8 pages, Latex 2.09, Contribution to the Proceedings of the 30th International Symposium Ahrenshoop on the Theory of Elementary Particles, Buckow, August 27-31, 1996

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