(Non-)Anomalous D-brane and O-plane couplings: the normal bundle
Ben Craps, Frederik Roose
TL;DR
This paper extends string theory calculations of D-brane and O-plane couplings to include normal bundle curvature, fixing their normalization and discovering new non-anomalous gravitational couplings.
Contribution
It provides a comprehensive extension of anomalous coupling computations by incorporating normal bundle curvature and identifies new non-anomalous gravitational couplings.
Findings
Normal bundle curvature terms are included in D-brane and O-plane couplings.
Normalization of these couplings is determined unambiguously.
New non-anomalous gravitational couplings are identified.
Abstract
The direct string computation of anomalous D-brane and orientifold plane couplings is extended to include the curvature of the normal bundle. The normalization of these terms is fixed unambiguously. New, non-anomalous gravitational couplings are found.
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