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

@article{Cveti2007HierarchiesFD,
  title={Hierarchies from D-brane instantons in globally defined Calabi-Yau orientifolds.},
  author={Mirjam Cveti{\vc} and Timo Weigand},
  journal={Physical review letters},
  year={2007},
  volume={100 25},
  pages={
          251601
        }
}
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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References

SHOWING 1-10 OF 12 REFERENCES

Nucl

  • Phys. B 771
  • 2007

JHEP 0510

  • 086
  • 2005

arXiv:0709.0245 [hep-th]

  • JHEP
  • 2007

JHEP 9906

  • 034
  • 1999

Phys

  • Rev. D 68, 046002
  • 2003

JHEP 0702

  • 028
  • 2007

Nucl

  • Phys. B 782, 26
  • 2007

JHEP 0002

  • 030
  • 2000

JHEP 0706

  • 011
  • 2007

Phys

  • Rev. D 75, 025019
  • 2007