The spectral structure of linearization around soliton in the \phi 4 and s-G models is presented. Negative radiation pressure in \phi 4 model is discussed and analytical calculation presented in the second order. The production of topological defects forced by radiation coupled to the internal degree of freedom of soliton is studied. The fractal boundary for this creation is also described.
PACS numbers: 02.30.Jr, 02.60.Cb, 03.50.--z
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