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Generalised Fourier transform and perturbations to soliton equations

Grahovski, Georgi and Ivanov, Rossen (2009) 'Generalised Fourier transform and perturbations to soliton equations.' Discrete & Continuous Dynamical Systems - B, 12 (3). pp. 579-595. ISSN 1553-524X

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Abstract

A brief survey of the theory of soliton perturbations is presented. 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 KdV hierarchy, in particular the Ostrovsky equation, followed by the perturbation theory for the Camassa-Holm hierarchy are presented.

Item Type: Article
Additional Information: 20 pages, no figures, to appear in: Discrete and Continuous Dynamical Systems B
Uncontrolled Keywords: nlin.SI
Subjects: Q Science > QA Mathematics
Q Science > QC Physics
Divisions: Faculty of Science and Health
Faculty of Science and Health > Mathematical Sciences, Department of
SWORD Depositor: Elements
Depositing User: Elements
Date Deposited: 30 Jan 2015 16:27
Last Modified: 12 Apr 2022 15:22
URI: http://repository.essex.ac.uk/id/eprint/11681

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