Stringy instanton corrections to N=2 gauge couplings

Details Stringy instanton corrections to N=2 gauge couplings Stringy instanton corrections to N=2 gauge couplings

2010-02-23

arxiv.org/abs/1002.4322v2

JHEP 05 (2010) 107 pag. 1-63

Physics

High Energy Physics

High Energy Physics - Theory

63 pages, 5 figures. V2: final version with minor corrections published on JHEP05(2010)107

Scientific paper

10.1007/JHEP05(2010)107

We discuss a string model where a conformal four-dimensional N=2 gauge theory receives corrections to its gauge kinetic functions from "stringy" instantons. These contributions are explicitly evaluated by exploiting the localization properties of the integral over the stringy instanton moduli space. The model we consider corresponds to a setup with D7/D3-branes in type I' theory compactified on T4/Z2 x T2, and possesses a perturbatively computable heterotic dual. In the heteoric side the corrections to the quadratic gauge couplings are provided by a 1-loop threshold computation and, under the duality map, match precisely the first few stringy instanton effects in the type I' setup. This agreement represents a very non-trivial test of our approach to the exotic instanton calculus.

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