Gauge couplings in four-dimensional Type I string orbifolds
arXiv:hep-th/9906039 · doi:10.1016/S0550-3213(99)00452-6
Abstract
We compute threshold effects to gauge couplings in four-dimensional orientifold models of type I strings with and 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
54 pages, LaTeX, comments and references added, final version to appear in Nucl. Phys. B
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