Analysis and classification of nonlinear dispersive evolution equations in the potential representation

Details Analysis and classification of nonlinear dispersive evolution equations in the potential representation Analysis and classification of nonlinear dispersive evolution equations in the potential representation

2002-01-25

arxiv.org/abs/math-ph/0201054v1

Physics

Mathematical Physics

16 latex pages, 5 figures in png

Scientific paper

A potential representation for the subset of traveling solutions of nonlinear dispersive evolution equations is introduced. The procedure involves a reduction of a third order partial differential equation to a first order ordinary differential equation. In this representation it can be shown that solitons and solutions with compact support only exist in systems with linear or quadratic dispersion, respectively. In particular, this article deals with so the called K(n,m) equations. It is shown that these equations can be classified according to a simple point transformation. As a result, all equations that allow for soliton solutions join the same equivalence class with the Korteweg-deVries equation being its representative.

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