Ruderman, M.S. orcid.org/0000-0003-2324-8466, Petrukhin, N.S. and Pelinovsky, E. (2022) Stability of KdV solitons with respect to transverse perturbations: Absolute and convective instabilities. Physica Scripta, 97 (7). 075206. ISSN 0031-8949
Abstract
We study the stability of one-dimensional solitons propagating in an anisotropic medium. We derived the Kadomtsev-Petviashvili equation for nonlinear waves propagating in an anisotropic medium. By a proper variable substitution this equation reduces either to the KPI or to the KPII equation. In the former case solitons are unstable with respect to the normal modes of transverse perturbations, and in the latter they are stable. We only consider the case when the solitons are unstable. We formulated the linear stability problem. Using the Laplace–Fourier transform, we found the solution describing the evolution of an initial perturbation. Then, using Briggs' method we studied the absolute and convective instabilities. We found that a soliton is convectively unstable unless it propagates at an angle smaller then critical with respect to a critical direction defined by the condition that the group velocity is parallel to the phase velocity. The critical angle is proportional to the ratio of the dispersion length to the soliton width, which is a small parameter. The coefficient of proportionality is expressed in terms of the phase speed and its second derivative with respect to the angle between the propagation direction and the critical direction. As an example we consider the stability of solitons propagating in Hall plasmas.
Metadata
Item Type: | Article |
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Authors/Creators: |
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Copyright, Publisher and Additional Information: | © 2022 The Author(s). Published by IOP Publishing Ltd. Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. (http://creativecommons.org/licenses/by/4.0) |
Keywords: | solitons; soliton stability; Korteweg-de Vries equation; Kadomtsev-petviashvili equation; absolute and convective instabilities |
Dates: |
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Institution: | The University of Sheffield |
Academic Units: | The University of Sheffield > Faculty of Science (Sheffield) > School of Mathematics and Statistics (Sheffield) |
Depositing User: | Symplectic Sheffield |
Date Deposited: | 20 Jun 2022 16:18 |
Last Modified: | 20 Jun 2022 16:18 |
Status: | Published |
Publisher: | IOP Publishing |
Refereed: | Yes |
Identification Number: | 10.1088/1402-4896/ac620f |
Open Archives Initiative ID (OAI ID): | oai:eprints.whiterose.ac.uk:188195 |