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The theory of soliton perturbations is considered. The focus is on the usefulness of the so-called Generalised Fourier Transform (GFT). This is a method that involves expansions over the complete basis of “squared solutions” of the spectral problem, associated to the soliton equation. The Inverse Scattering Transform for the corresponding hierarchy of soliton equations can be viewed as a GFT where the expansions of the solutions have generalised Fourier coefficients given by the scattering data. The GFT provides a natural setting for the analysis of small perturbations to an integrable equation: starting from a purely soliton solution one can ’modify’ the soliton parameters such as to incorporate the changes caused by the perturbation. As illustrative examples the perturbed equations of the Camassa-Holm hierarchy are presented.
Grahovski,G.G., Ivanov.R.I.: The Camassa-Holm Hierarchy and Soliton Perturbations . BGSIAM'09 Proceedings, Eds: S. Margenov, S. Dimova and A. Slavova, Demetra Publishing, Sofia (2010), pp. 58-63.