Stringy instanton corrections to N=2 gauge couplings
Abstract
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.
Cite
@article{arxiv.1002.4322,
title = {Stringy instanton corrections to N=2 gauge couplings},
author = {Marco Billo' and Marialuisa Frau and Francesco Fucito and Alberto Lerda and Jose F. Morales and Rubik Poghossian},
journal= {arXiv preprint arXiv:1002.4322},
year = {2014}
}
Comments
63 pages, 5 figures. V2: final version with minor corrections published on JHEP05(2010)107