Abstract
We identify and evaluate a class of physical amplitudes in four-dimensional N = 4 superstring theory, which receive, in the weak-coupling limit, contributions of order e −1 λ , where λ is the type II superstring coupling constant. They correspond to four-derivative F 1 interaction terms involving the universal type II dilaton supermultiplet. The exact results, obtained by means of a one-loop computation in the dual heterotic theory compactified on ⊤ 6, is compared with the perturbation theory on the type II side, and the e −1 λ contributions are associated to non-perturbative effects of Euclidean solitons (D-branes) wrapped on K3 × ⊤ 2. The ten-dimensional decompactification limit on the type IIB side validates the recent conjecture for the D-instanton-induced R 4 couplings.
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