To be or not to be? Magnetic monopoles in non-abelian gauge theories

Abstract

Magnetic monopoles form an inspiring chapter of theoretical physics, covering a variety of surprising subjects. We review their role in non-abelian gauge theories. An expose of quite exquisite physics derived from a hypothetical particle species, because the fact remains that in spite of ever more tempting arguments from theory, monopoles have never reared their head in experiment. For many relevant particulars, references to the original literature are provided.

34 pages, 7 figures, Contribution to "Fifty Years of Yang- Mills Theory", edited by G. 't Hooft. Some extra references have been added in the revised version

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