On the Heterotic/F-Theory Duality in Eight Dimensions
Abstract
We review quantitative tests on the duality between the heterotic string on T2 and F-theory on K3. On the heterotic side, certain threshold corrections to the effective action can be exactly computed at one-loop order, and the issue is to reproduce these from geometric quantities pertaining to the K3 surface. In doing so we learn about certain non-perturbative interactions of 7-branes.
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