Non-Perturbative Structure in Heterotic Strings from Dual F-Theory Models

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SWAT-213hep-th/9901028Non-Perturbative Structure in Heterotic Strings from Dual F–Theory Models 1D′o nal O’Driscoll Department of Physics,University of Wales Swansea Singleton Park,Swansea,SA28PP,UK pydan@http://www.csgoeats.com/doc/info-1499fa8a84868762caaed5e6.html Abstract We examine how to construct explicit heterotic string models dual to F–theory in eight dimensions.In doing so we learn about where the moduli spaces of the two theories overlap,and how non–perturbative features leave their trace on a purely perturbative level.We also brie?y look at the relationship with NS9–branes

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