Calculable e{-1}/{λ} effects
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 overlineF1 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 R4 couplings.
- Publication:
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Nuclear Physics B
- Pub Date:
- February 1998
- DOI:
- 10.1016/S0550-3213(97)00684-6
- arXiv:
- arXiv:hep-th/9707222
- Bibcode:
- 1998NuPhB.512...61A
- Keywords:
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- High Energy Physics - Theory
- E-Print:
- LaTex, 24 pages