Abstract
Witten's formula for the dyon charge in the presence of a CP violating surface term is derived by a canonical argument.
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Reference
E. Witten, CERN preprint TH. 2724 (1979).
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Salam, A., Strathdee, J. On Witten's charge formula. Lett Math Phys 4, 505–508 (1980). https://doi.org/10.1007/BF00943437
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DOI: https://doi.org/10.1007/BF00943437