Michele Cicoli, Sven Krippendorf, Christoph Mayrhofer, Fernando Quevedo, Roberto Valandro
In the framework of type IIB string compactifications on Calabi-Yau orientifolds we describe how to construct consistent global embeddings of models with fractional D3-branes and `flavour' D7-branes at del Pezzo singularities with moduli stabilisation. We find that most of the flavour D7-brane configurations allowed in strictly-local models do not have a consistent embedding in a compact Calabi-Yau. Our results are applied to build an explicit compact example with a left-right symmetric model at a dP0 singularity which features three families of chiral matter and gauge coupling unification at the intermediate scale. We show how to stabilise the moduli obtaining a controlled de Sitter minimum and spontaneous supersymmetry breaking. We find an interesting non-trivial dynamical relation between the requirement of TeV-scale soft terms and the correct phenomenological values of the unified gauge coupling and unification scale.
View original:
http://arxiv.org/abs/1304.0022
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