A comment on discrete Kalb-Ramond field on orientifold and rank reduction

Abstract

We show that the rank reduction of the gauge group on orientifolds in presence of non vanishing discrete Kalb-Ramond field can be explained by the presence of an induced field strength in a non trivial bundle on the branes. This field strength is also necessary for the tadpole cancellation and the number of branes is left unchanged by the presence of the discrete Kalb-Ramond background.

v2: added references, improved introduction and corrected misprints; 15 pages

References in corpus (3)

• New twist field couplings from the partition function for multiply wrapped D-branes
• Wrapped Magnetized Branes: Two Alternative Descriptions?
• Boundary states for branes with non trivial homology in constant closed and open background

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• Orientifolds and D-branes in N=2 gauged linear sigma models
• From Twists and Shifts to L-R asymmetric D-branes