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Dirac's argument for electric charge quantization is not to be taken lightly because it is the first "topological conservation law" uncovered in Abelian gauge theory. Since Dirac's two papers on the magnetic monopole were published, other potential physical examples of "topological conservation laws" have been identified in non-Abelian gauge theories which have revealed the rich topological structure of QCD ... Moreover, with regard to Dirac's ECQ argument, it is likely that — within the framework of the standard model — ECQ is well explained by the chiral gauge anomaly-free constraints, which, to some extent, contain topological information ... (en) |
