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