TL;DR
This paper investigates non-perturbative effects in a specific string theory setup, demonstrating how stringy instantons contribute to gauge functions and confirming duality predictions through explicit calculations.
Contribution
It provides a detailed calculation of stringy instanton effects in a type I' string theory model, validating duality predictions with localization techniques.
Findings
Explicit evaluation of non-perturbative corrections using localization
Matching of instanton contributions with heterotic/type I' duality predictions
Validation of stringy multi-instanton calculus
Abstract
We discuss non-perturbative corrections to the gauge kinetic functions in a four-dimensional N=2 gauge theory realized with a system of D7/D3-branes in a compactification of type I' theory on T_4/Z_2 x Z_2. The non-perturbative contributions arise when D(-1) branes, corresponding to stringy instantons, are added to the system; such contributions can be explicitly evaluated using localization techniques and precisely match the results predicted by the heterotic/type I' duality. This agreement represents a very non-trivial test of the stringy multi-instanton calculus.
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