Anomalous couplings for D-branes and O-planes
نویسندگان
چکیده
We study anomalous Wess-Zumino couplings of D-branes and O-planes in a general background and derive them from a direct string computation by factorizing in the RR channel various one-loop amplitues. In particular, we find that Op-planes present gravitational anomalous couplings involving the Hirzebruch polynomial L̂, similarly to the roof genus  encoding Dp-brane anomalous couplings. We determine, in each case, the precise dependence of these couplings on the curvature of the tangent and normal bundles. e On leave from SISSA/ISAS, via Beirut 2, 34100 Trieste, Italy
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تاریخ انتشار 1998