Abstract
The motion of a one-dimensional kink and its energy losses are considered as a model of interaction of nontrivial topological field configurations with external fields. The approach is based on the calculation of the zero-mode excitation probability in the external field. We study in the same way the interaction of the 't Hooft--Polyakov monopole with weak external fields. The basic idea is to treat the excitation of a monopole zero mode as the monopole displacement. The excitation is found perturbatively. As an example we consider the interaction of the 't Hooft--Polyakov monopole with an external uniform magnetic field.
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