arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.12309nlin.SI
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(4 + 1)维Fokas方程的约化及其解

Reductions of the (4 + 1)-dimensional Fokas equation and their solutions

Yulei Cao, Jingsong He, Yi Cheng, Dumitru Mihalache

摘要:

本文研究了Kadomtsev-Petviashvili(KP)和Davey-Stewartson(DS)方程的一个可积推广,称之为(4+1)维Fokas方程.基于Hirota双线性方法和KP降阶方法,构造了(4 + 1)维Fokas方程的孤子解、呼吸子解、有理解和半有理解的行列式表达式.这些新的精确解的复杂动力学都显示在三维图和二维等高线图。有趣的是,通过选择不同的模型自由参数值,得到的高阶块的图案类似于(1 + 1)维的流氓波。在此基础上,给出了三种新的半有理解,并讨论了块体裂变和聚变过程的分类。另外,通过约化(4 + 1)维Fokas方程的解,给出了一种新的方法来获得(3 + 1)维KP方程的有理解和半有理解.所有这些结果表明,(4 + 1)维Fokas方程是KP和DS方程的一个有意义的多维推广。所得结果在流体力学、非线性光学和光子学、等离子体中的离子声波、玻色-爱因斯坦凝聚体中的物质波以及铁磁介质中的声波等领域都有应用价值。

英文摘要:

An integrable extension of the Kadomtsev-Petviashvili (KP) and Davey-Stewartson (DS) equations is investigated in this paper.We will refer to this integrable extension as the (4+1)-dimensional Fokas equation. The determinant expressions of soliton, breather, rational, and semi-rational solutions of the (4 + 1)-dimensional Fokas equation are constructed based on the Hirota's bilinear method and the KP hierarchy reduction method. The complex dynamics of these new exact solutions are shown in both three-dimensional plots and two-dimensional contour plots. Interestingly, the patterns of obtained high-order lumps are similar to those of rogue waves in the (1 + 1)-dimensions by choosing different values of the free parameters of the model. Furthermore, three kinds of new semi-rational solutions are presented and the classification of lump fission and fusion processes is also discussed. Additionally, we give a new way to obtain rational and semi-rational solutions of (3 + 1)-dimensional KP equation by reducing the solutions of the (4 + 1)-dimensional Fokas equation. All these results show that the (4 + 1)-dimensional Fokas equation is a meaningful multidimensional extension of the KP and DS equations. The obtained results might be useful in diverse fields such as hydrodynamics, non-linear optics and photonics, ion-acoustic waves in plasmas, matter waves in Bose-Einstein condensates, and sound waves in ferromagnetic media.

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