Gauge couplings in four-dimensional Type I string orbifolds

C. Bachas; E. Dudas; I. Antoniadis

Gauge couplings in four-dimensional Type I string orbifolds

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arxiv hep-th/9906039 v2 pith:ZJFFACHW submitted 1999-06-04 hep-th hep-ph

I. Antoniadis , C. Bachas , E. Dudas This is my paper

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keywords gaugecouplingscomputeeffectsfour-dimensionalmodelsmodulistring

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abstract

We compute threshold effects to gauge couplings in four-dimensional $Z_N$ orientifold models of type I strings with ${\cal N}=2$ and ${\cal N}=1$ supersymmetry, and study their dependence on the geometric moduli. We also compute the tree-level (disk) couplings of the open sector gauge fields to the twisted closed string moduli of the orbifold in various models and study their effects and that of the one-loop threshold corrections on gauge coupling unification. We interpret the results from the (supergravity) effective theory point of view and comment on the conjectured heterotic-type I duality

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