Summary
In this paper we derive and investigate the class of non-linear evolution equations (NEEs) associated with the linear problemϕx=λAψ. It turns out that many physically interesting NEEs pertain to this class: for instance, the chiral-field equation, the nonlinear Klein-Gordon equations, the Heisenberg and Papanicolau spin chain models, the modified Boussinesq equation, the Wadati-Konno-Ichikawa equations, etc. We display also the Bäcklund transformations for such a class and exploit them to derive in a special case the one-soliton solution.
Riassunto
In questo lavoro si deriva e studia la classe di equazioni nonlineari di evoluzione associate con il problema lineareϕx=λAψ. A questa classe appartengono molte equazione interessanti: per esempio l’equazione del campo chirale, le equazioni di Klein-Gordon non lineari, i modelli di spin di Heisenberg e Papanicolau, l’equazione di Boussinesq modificata, le equazioni di Wadati-Konno-Ichikawa, ecc. Per questa classe di equazioni sono anche mostrate le trasformate di Bäcklund, utilizzate per derivare, in un caso particolare, la soluzione ad un solitone.
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References
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Bruschi, M., Ragnisco, O. Nonlinear evolution equations associated with the chiral-field spectral problem. Nuov Cim B 88, 119–139 (1985). https://doi.org/10.1007/BF02728895
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DOI: https://doi.org/10.1007/BF02728895