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arXiv 1502.01193nlin.SImath-phmath.MP
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格点势KdV方程的谱变换和守恒律

Spectrum transformation and conservation laws of the lattice potential KdV equation

Senyue Lou, Ying Shi, Da-jun Zhang

摘要:

许多多维相容离散系统的孤子解具有非零背景,这给可积性的研究带来了困难。在这封信中,我们推导出无穷多个守恒量的晶格势Korteweg-de Vries方程。推导是基于散射数据$a(z)$与离散空间和时间无关的事实以及离散薛定谔谱问题的Jost解的解析性质。得到的守恒密度不同于已知文献中的守恒密度。当$|n|$(或$|m|$)趋于无穷大时,它们渐近于零。为了得到这些结果,我们重建一个离散的Riccati方程,通过使用保角映射转换的上复平面的单位圆的内部。利用Jost解的解析性质和渐近性质构造了Riccati方程的级数解。

英文摘要:

Many multi-dimensional consistent discrete systems have soliton solutions with nonzero backgrounds, which brings difficulty in the investigation of integrable characteristics. In this letter we derive infinitely many conserved quantities for the lattice potential Korteweg-de Vries equation. The derivation is based on the fact that the scattering data $a(z)$ is independent of discrete space and time and the analytic property of Jost solutions of the discrete Schrödinger spectral problem. The obtained conserved densities are different from those in the known literatures. They are asymptotic to zero when $|n|$ (or $|m|$) tends to infinity. To obtain these results, we reconstruct a discrete Riccati equation by using a conformal map which transforms the upper complex plane to the inside of unit circle. Series solution to the Riccati equation is constructed based on the analytic and asymptotic properties of Jost solutions.

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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