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Bifurcation of the travelling wave solutions in a perturbed (1 + 1)-dimensional dispersive long wave equation via a geometric approach

Part of: Equations of mathematical physics and other areas of application Hyperbolic equations and systems Waves Stability theory

Published online by Cambridge University Press:  25 April 2024

Hang Zheng  and
Yonghui Xia Open the ORCID record for Yonghui Xia [Opens in a new window]
Hang Zheng
Affiliation:
Department of Mathematics and Computer, Wuyi University, Wuyishan 354300, China (zhenghang513@zjnu.edu.cn, zhenghwyxy@163.com)
Yonghui Xia*
Affiliation:
School of Mathematics and Big Data Foshan University, Foshan 528000, China (xiadoc@163.com, yhxia@zjnu.cn)
*
*Corresponding author.
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Abstract

Choosing ${\kappa }$ (horizontal ordinate of the saddle point associated to the homoclinic orbit) as bifurcation parameter, bifurcations of the travelling wave solutions is studied in a perturbed $(1 + 1)$-dimensional dispersive long wave equation. The solitary wave solution exists at a suitable wave speed $c$ for the bifurcation parameter ${\kappa }\in \left (0,1-\frac {\sqrt 3}{3}\right )\cup \left (1+\frac {\sqrt 3}{3},2\right )$, while the kink and anti-kink wave solutions exist at a unique wave speed $c^*=\sqrt {15}/3$ for $\kappa =0$ or $\kappa =2$. The methods are based on the geometric singular perturbation (GSP, for short) approach, Melnikov method and invariant manifolds theory. Interestingly, not only the explicit analytical expression of the complicated homoclinic Melnikov integral is directly obtained for the perturbed long wave equation, but also the explicit analytical expression of the limit wave speed is directly given. Numerical simulations are utilized to verify our mathematical results.

Keywords

wave equationsolitary wave solutionsgeometric singular perturbation

MSC classification

Primary: 35Q35: PDEs in connection with fluid mechanics
Secondary: 35L05: Wave equation 74J30: Nonlinear waves 34D15: Singular perturbations

Information

Type
Research Article
Information
Proceedings of the Royal Society of Edinburgh Section A: Mathematics , Volume 156 , Issue 1 , February 2026 , pp. 129 - 156
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Copyright
© The Author(s), 2024. Published by Cambridge University Press on behalf of The Royal Society of Edinburgh

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