Gauge couplings in four-dimensional Type I string orbifolds

Details Gauge couplings in four-dimensional Type I string orbifolds Gauge couplings in four-dimensional Type I string orbifolds

1999-06-04

arxiv.org/abs/hep-th/9906039v2

Nucl.Phys. B560 (1999) 93-134

Physics

High Energy Physics

High Energy Physics - Theory

54 pages, LaTeX, comments and references added, final version to appear in Nucl. Phys. B

Scientific paper

10.1016/S0550-3213(99)00452-6

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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