Comments on Orientifolds without Vector Structure
arXiv:0805.3696 · doi:10.1088/1126-6708/2008/08/016
Abstract
We revisit type I compactifications with a Spin(32)/Z2 gauge bundle that admits no vector structure. We elucidate the relation of this Z2 obstruction to discrete B-field flux and to 't Hooft flux and clarify some subtleties in the T-duality transformation to type IIA intersecting D-brane models. We reexamine the earliest 3-generation GUT model on magnetized D-branes and show its consistency when a discrete B-flux is switched on. We further generalize partially known results for toroidal models to type I compactifications without vector structure and their mirror dual type IIA orientifolds on genuine Calabi-Yau manifolds. We illustrate this by working out the example of the quintic in some detail.
34 pages, 3 figures, 1 table
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Cited by in corpus (17)
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- The effective action of D6-branes in N=1 type IIA orientifolds
- Gauge Threshold Corrections for Local Orientifolds
- The Generalized Green-Schwarz Mechanism for Type IIB Orientifolds with D3- and D7-Branes
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