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We have studied the internal dynamics of multiple and single double-sine-Gordon (DSG) soliton configurations using molecular dynamics. Investigation of the small-oscillation dispersion relation of the multiple-kink configuration revealed a new branch associated with the internal dynamics of the DSG soliton. Subsequent investigation of the internal dynamics of a single DSG kink demonstrated strong nonlinear effects which were reflected in the complicated frequency spectra that ensued.
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Burdick et al. (1986) studied this question.
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