Hierarchies from D-brane instantons in globally defined Calabi-Yau orientifolds.

  title={Hierarchies from D-brane instantons in globally defined Calabi-Yau orientifolds.},
  author={Mirjam Cveti{\vc} and Timo Weigand},
  journal={Physical review letters},
  volume={100 25},
We construct the first globally consistent semirealistic type I string vacua on an elliptically fibered manifold where the zero modes of the Euclidean D1-instanton sector allow for the generation of nonperturbative Majorana masses of an intermediate scale. In another class of global models, a D1-brane instanton can generate a Polonyi-type superpotential breaking supersymmetry at an exponentially suppressed scale. 

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