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 T4/ℤ2 × ℤ2. 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.
Stringy instantons and dualities
FRAU, Marialuisa
2011-01-01
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 T4/ℤ2 × ℤ2. 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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