Comments on Orientifolds without Vector Structure

Details Comments on Orientifolds without Vector Structure Comments on Orientifolds without Vector Structure

2008-05-26

arxiv.org/abs/0805.3696v1

JHEP 0808:016,2008

Physics

High Energy Physics

High Energy Physics - Theory

34 pages, 3 figures, 1 table

Scientific paper

10.1088/1126-6708/2008/08/016

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.

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