# Dirac Charge Quantization and Generalized Differential Cohomology

@article{Freed2000DiracCQ, title={Dirac Charge Quantization and Generalized Differential Cohomology}, author={Daniel S. Freed}, journal={arXiv: High Energy Physics - Theory}, year={2000} }

The main new result here is the cancellation of global anomalies in the Type I superstring, with and without D-branes. Our argument here depends on a precise interpretation of the 2-form abelian gauge field using KO-theory; then the anomaly cancellation follows from a geometric form of the full Atiyah-Singer index theorem for families of Dirac operators. This is a refined version of the Green-Schwarz mechanism. It seems that a geometric interpretation of this mechanism-the cancellation of local…

## 156 Citations

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