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arXiv 1802.10044nlin.SImath-phmath.MPquant-ph
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离散Crum定理与可积格方程

Discrete Crum's Theorems and Integrable Lattice Equations

Cheng Zhang, Linyu Peng, Da-jun Zhang

摘要:

在本文中,我们建立了两个二阶差分方程的离散形式的达布变换和Crum定理。差分方程的离散化版本(使用达布变换)的频谱问题的KdV方程,修改的KdV方程或sine-Gordon方程。考虑差分方程通过达布变换产生的离散动力学,得到了格点势KdV方程、格点势修正KdV方程和格点Schwarzian KdV方程,它们是可积格点方程的原型。事实证明,沿着离散化过程中使用达布变换,两个家庭的可积系统(KdV家庭,和修改的KdV或sine-Gordon家庭),包括其连续,半离散和晶格版本,明确地构建。作为离散Crum定理的直接应用,得到了格点方程的多孤子解。

英文摘要:

In this paper, we develop discrete versions of Darboux transformations and Crum's theorems for two second order difference equations. The difference equations are discretised versions (using Darboux transformations) of the spectral problems of the KdV quation, and of the modified KdV equation or sine-Gordon equation. Considering the discrete dynamics created by Darboux transformations for the difference equations, one obtains the lattice potential KdV equation, the lattice potential modified KdV equation and the lattice Schwarzian KdV equation, that are prototypes of integrable lattice equations. It turns out that, along the discretisation processes using Darboux transformations, two families of integrable systems (the KdV family, and the modified KdV or sine-Gordon family), including their continuous, semi-discrete and lattice versions, are explicitly constructed. As direct applications of the discrete Crum's theorems, multi-soliton solutions of the lattice equations are obtained.

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