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• W2009846502 abstract "The dynamics of sine-Gordon kinks in the presence of rapidly varying periodic perturbations of different physical origins is described analytically and numerically. The analytical approach is based on asymptotic expansions, and it allows one to derive, in a rigorous way, an effective nonlinear equation for the slowly varying field component in any order of the asymptotic procedure as expansions in the small parameter ${mathrm{ensuremath{omega}}}^{mathrm{ensuremath{-}}1}$, ensuremath{omega} being the frequency of the rapidly varying ac driving force. Three physically important examples of such a dynamics, i.e., kinks driven by a direct or parametric ac force, and kinks on a rotating and oscillating background, are analyzed in detail. It is shown that in the main order of the asymptotic procedure the effective equation for the slowly varying field component is a renormalized sine-Gordon equation in the case of the direct driving force or rotating (but phase locked to an external ac force) background, and it is the double sine-Gordon equation for the parametric driving force. The properties of the kinks described by the renormalized nonlinear equations are analyzed, and it is demonstrated analytically and numerically which kinds of physical phenomena may be expected in dealing with the renormalized, rather than the unrenormalized, nonlinear dynamics. In particular, we predict several qualitatively new effects which include, e.g., the perturbation-induced internal oscillations of the 2ensuremath{pi} kink in a parametrically driven sine-Gordon model, and the generation of kink motion by a pure ac driving force on a rotating background." @default.
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• W2009846502 date "1994-05-01" @default.
• W2009846502 modified "2023-09-27" @default.
• W2009846502 title "Kinks in the presence of rapidly varying perturbations" @default.
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• W2009846502 doi "https://doi.org/10.1103/physreve.49.4542" @default.
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