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arXiv 2104.02272nlin.SImath-phmath.MP
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非零边界条件下耦合修正Korteweg-de Vries方程的逆散射变换

Inverse scattering transform of the coupled modified Korteweg-de Vries equation with nonzero boundary conditions

Xiao-Fan Zhang, Shou-Fu Tian, Jin-Jie Yang

摘要:

本文将Riemann-Hilbert(RH)方法推广到非零边界条件下的耦合修正Korteweg-de Vries方程(cmKdV),并成功地找到了具有各种动力学传播行为的解.在谱分析过程中,为了避免讨论多值函数,需要引入Riemann曲面,并获得建立RH问题所需的解析性质和渐近性质。由于本征函数中有一列在给定区域内是非解析的,因此我们引入了辅助本征函数和伴随矩阵,这是导出解析本征函数所必需的。由于本征函数具有三种对称性,散射矩阵也具有三种对称性,因此我们将离散谱分为三类。导出了修正本征函数的渐近性。在此基础上,建立了在给定区域内具有四个跳跃矩阵的RH问题,揭示了cmKdV方程与RH问题解之间的关系。建立了单极点反射系数的留数条件。根据离散谱的分类,详细讨论了三种离散谱分类对应的孤子解及其传播行为。

英文摘要:

In this work, we extend the Riemann-Hilbert (RH) method in order to study the coupled modified Korteweg-de Vries equation (cmKdV) under nonzero boundary conditions (NZBCs), and successfully find its solutions with their various dynamic propagation behaviors. In the process of spectral analysis, it is necessary to introduce Riemann surface to avoid the discussion of multi-valued functions, and to obtain the analytical and asymptotic properties needed to establish the RH problem. The eigenfunction have a column that is not analytic in a given region, so we introduce the auxiliary eigenfunction and the adjoint matrix, which is necessary to derive the analytical eigenfunctions. The eigenfunctions have three kinds of symmetry, which leads to three kinds of symmetry of the scattering matrix, and the discrete spectrum is also divided into three categories by us. The asymptoticity of the modified eigenfunction is derived. Based on the analysis, the RH problem with four jump matrices in a given area is established, and the relationship between the cmKdV equation and the solution of the RH problem is revealed. The residue condition of reflection coefficient with simple pole is established. According to the classification of discrete spectrum, we discuss the soliton solutions corresponding to three kinds of discrete spectrum classification and their propagation behaviors in detail.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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