A Dyon is a theoretical concept in physics, particularly in the field of quantum field theory and string theory. It can be considered a generalization of a monopole—specifically, a magnetic monopole that also carries electric charge. In more detail, dyons are hypothetical particles that possess both electric and magnetic charges.
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A dyon carries both electric and magnetic charge. In an appropriate extended supersymmetry theory, a BPS state with these charges has mass fixed by their complex combination in the central charge in supersymmetry. Not every electrically and magnetically charged state must saturate that bound.