Branes and Fluxes in Orientifolds and K-theory

Details Branes and Fluxes in Orientifolds and K-theory Branes and Fluxes in Orientifolds and K-theory

2002-06-19

arxiv.org/abs/hep-th/0206183v4

Nucl.Phys. B694 (2004) 405-442

Physics

High Energy Physics

High Energy Physics - Theory

47 pages, latex, no figures. v4: Typos corrected, exposition improved. Main conclusions unchanged. To be published in Nuclear

Scientific paper

10.1016/j.nuclphysb.2004.06.015

RR fields in string backgrounds including orientifold planes and branes on top of them are classified by K-theory. Following the idea introduced in hep-th/0103183, we also classify such fluxes by cohomology. Both of them are compared through the Atiyah-Hirzebruch Spectral Sequence. Some new correlations between branes on orientifold planes $Op^\pm$ and obstructions to the existence of some branes are found. Finally, we find a topological condition that avoid the presence of global gauge anomalies in lower dimensional systems.

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