On gauge couplings and thresholds in Type I Gepner models and otherwise

Details On gauge couplings and thresholds in Type I Gepner models and otherwise On gauge couplings and thresholds in Type I Gepner models and otherwise

2006-12-21

arxiv.org/abs/hep-th/0612234v2

JHEP 0703:059,2007

Physics

High Energy Physics

High Energy Physics - Theory

33 pages

Scientific paper

10.1088/1126-6708/2007/03/059

We derive general formulae for tree level gauge couplings and their one-loop thresholds in Type I models based on genuinely interacting internal N=2 SCFT's, such as Gepner models. We illustrate our procedure in the simple yet non-trivial instance of the Quintic. We briefly address the phenomenologically more relevant issue of determining the Weinberg angle in this class of models. Finally we initiate the study of the correspondence between `magnetized' or `coisotropic' D-branes in Gepner models and twisted representations of the underlying N=2 SCA.

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