Abstract
We show that complex higher-order lump patterns can be constructed in two different ways within the Kadomtsev–Petviashvili (KP1) equation which describes nonlinear wave processes in media with positive dispersion. In the first approach, we start with solutions describing stationary moving higher-order lump chains. By degenerating these solutions, we obtain first coupled lump chains which reduce then to multi-lump bound states in the limit when the period of lump chains goes to infinity. In another approach, a skilful technique is exploited to derive multi-lump bound states directly from the N-soliton solution of the KP1 equation presented in the Hirota form. It is shown then that through the proper selection of soliton parameters, these higher-order solutions can be reduced to the various lump patterns, such as triangular, polygonal patterns, and so on. The suggested approaches can be extended to another one- and multi-dimensional integrable systems to derive complex bound states and rogue waves.
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Acknowledgements
This research is supported by the Natural Science Foundation of Guangdong Province of China (No. 2021A1515012214), the Science and Technology Program of Guangzhou (No. 2019050001), National Natural Science Foundation of China (No. 12175111) and K.C.Wong Magna Fund in Ningbo University. The authors sincerely thank Dr. Junchao Chen (Lishui University) for the discussions. Yu.A. Stepanyants acknowledges the funding provided by the Council of the grants of the President of the Russian Federation for the state support of Leading Scientific Schools of the Russian Federation (Project No. NSH–70.2022.1.5).
Funding
This study was funded by the Natural Science Foundation of Guangdong Province of China (No. 2021A1515012214) and the Science and Technology Program of Guangzhou (No. 2019050001).
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Zhang, Z., Yang, X., Li, B. et al. Multi-lump formations from lump chains and plane solitons in the KP1 equation. Nonlinear Dyn 111, 1625–1642 (2023). https://doi.org/10.1007/s11071-022-07903-8
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DOI: https://doi.org/10.1007/s11071-022-07903-8