Curvature terms in D-brane actions and their M-theory origin
نویسندگان
چکیده
We derive the complete (curvature) terms of effective D-brane actions, for arbitrary ambient geometries and world-volume embeddings, at lowest order (disk-level) in the string-loop expansion. These terms reproduce the o(α′ ) corrections to string scattering amplitudes, and are consistent with duality conjectures. In the particular case of the D3-brane with trivial normal bundle, considerations of SL(2, ZZ) invariance lead to a complete sum of D-instanton corrections for both the parity-conserving and the parityviolating parts of the effective action. These corrections are required for the cancellation of the modular anomalies of massless modes, and are consistent with the absence of chiral anomalies in the intersection domain of pairs
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