A Torsion Correction to the RR 4-Form Fieldstrength
نویسنده
چکیده
The shifted quantization condition of the M-theory 4-form G4 is well-known. The most naive generalization to type IIA string theory fails, an orientifold fourplane counterexample was found by Hori in hep-th/9805141. In this note we use D2-brane anomaly cancellation to find the corresponding shifted quantitization condition in IIA. Our analysis is consistent with the known O4-plane tensions if we include a torsion correction to the usual construction of G4 from C3, B and G2. The resulting Bianchi identities enforce that RR fluxes lift to K-theory classes.
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