Abstract
Computations of non-perturbative contributions is still a difficult task. In (supersymmetric) Field theory a direct computation requires the construction of the measure of integration over vacua containing n-instantons, which is not yet available for every n. The use of dualities is still the main tool for getting the answer. In String theory the D-instantons contributions for the R 4 were conjectured thanks to the Sl(2, Z) invariance of the type IIb theory [1], and for the Spin(32)/Z 2 some ad hoc rules for the contributions for the R 4 and F 4 were derived from the S-duality relation between the Heterotic and Type I strings [2]. In this proceeding I will explain how these non-perturbative contributions can be computed exactly, concentrating on the eight-dimensional case. Details and generalizations will be found in [3].
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Vanhove, P. (1999). BPS Saturated Amplitudes and Non-Perturbative String Theory. In: Baulieu, L., Di Francesco, P., Douglas, M., Kazakov, V., Picco, M., Windey, P. (eds) Strings, Branes and Dualities. NATO ASI Series, vol 520. Springer, Dordrecht. https://doi.org/10.1007/978-94-011-4730-9_27
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DOI: https://doi.org/10.1007/978-94-011-4730-9_27
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