Abstract
The authors consider the dynamics of a point-like SU(2) isocharge which creates a weak disturbance in the field of a 't Hooft-Polyakov monopole. A local, gauge-invariant measure of the isocharge is introduced and its evolution is computed for various motions, to leading order in a small parameter epsilon , where epsilon measures the weakness of the disturbance. In contrast, to ordinary electromagnetic charge, the gauge-invariant isocharge need not remain constant, but rather undergoes a net change, for certain motions, as a result of its interaction with the monopole.
Published Version
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