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On Heterotic/Type I Duality in d=8

K. Foerger

hep-tharXiv:hep-th/9812154

Abstract

We discuss heterotic corrections to quartic internal U(1) gauge couplings and check duality by calculating one-loop open string diagrams and identifying the D-instanton sum in the dual type I picture. We also compute SO(8)4 threshold corrections and finally R2 corrections in type I theory.

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