Tachyon free nonsupersymmetric type IIB orientifolds via Brane - anti-brane systems
Aug, 199931 pages
Published in:
- JHEP 10 (1999) 024
e-Print:
- hep-th/9908072 [hep-th]
Report number:
- CAB-IB-2911299,
- IASSNS-HEP-99-79
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Abstract:
We derive the rules to construct type IIB compact orientifolds in six and four dimensions including D-branes and anti-D-branes. Even though the models are non-supersymmetric due to the presence of the anti-D-branes, we show that it is easy to construct large classes of models free of tachyons. Brane-antibrane annihilation can be prevented for instance by considering models with branes and antibranes stuck at different fixed points in the compact space. We construct several anomaly-free and tachyon-free six-dimensional orientifolds containing D9-branes and anti-D5-branes. This setup allows to construct four-dimensional chiral models with supersymmetry unbroken in the bulk and in some D-brane sectors, whereas supersymmetry is broken (at the string scale) in some `hidden' anti-D-brane sector. We present several explicit models of this kind. We also comment on the role of the non-cancelled attractive brane-antibrane forces and the non-vanishing cosmological constant, as providing interesting dynamics for the geometric moduli and the dilaton, which may contribute to their stabilization.- membrane model: D-brane
- dimension: 6
- dimension: 4
- compactification
- orientifold
- partition function
- particle: multiplet
- group theory: representation
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