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

G. L. Cardoso

hep-tharXiv:hep-th/9612200

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 F1 in terms of Siegel modular forms.

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