Abstract
The conditions for the occurrence of charged soliton solutions in scalar field theories with a global U(1) symmetry are examined. It is shown that in the rest frame of the soliton the phase of the charged field is a linear function of the time, ωt + α, where |ω| is in general bounded both from above and below. The charge has no upper bound. Quantization according to Bohr-Sommerfeld rules is shown to be equivalent to requiring that the charge takes on integer values. A solvable one-dimensional model is given as an example of the general results.
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