Discrete moduli for Type I compactifications

Abstract

We study type I compactification on a 4-torus, with a non-trivial discrete background RR 4-form field. By using string dualities and recent insights for gauge theories on tori, we find that a non-trivial background for the RR 4-form is correlated with Spin(32)/Z_2 bundles that are described by a ``non-trivial quadruple'' of holonomies. We also briefly discuss other discrete moduli for the type I string, and variants of orientifold planes.

16 pages, LaTeX; typo's corrected, reference added

References in corpus (2)

• Orientifolds, RR Torsion, and K-theory
• Classifying orientifolds by flat n-gerbes

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• Comments on Orientifolds without Vector Structure
• New Supersymmetric String Theories from Discrete Theta Angles
• Classifying orientifolds by flat n-gerbes
• A New String in Ten Dimensions?
• Novel Type I Compactifications
• Twisting E8 Five-Branes
• Issues on tadpoles and vacuum redefinitions in String Theory