One-loop Effective Action in Open-string theory
C. Fabre
Abstract
This is a summary of the analysis of the one-loop effective action in Z2-orbifold compactifications of type-I theory presented in references [1,2]. We show how, for non-abelian group factors, the threshold effects are ultraviolet finite though given entirely by a six-dimensional field theory expression. We also discuss implications for the equivalence between Type-I and Heterotic four dimensional N=2 superstring theories.
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