arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2102.05332nlin.PS
收藏

离散非线性薛定谔方程与Ablowitz-Ladik格的封闭性

The closeness of the Ablowitz-Ladik lattice to the Discrete Nonlinear Schrödinger equation

Dirk Hennig, Nikos I. Karachalios, Jesús Cuevas-Maraver

摘要:

虽然Ablowitz-Ladik格点是可积的,但对物理应用更有意义的离散非线性薛定谔方程却不是可积的。我们证明了这两个系统的解决方案在$l^2$和$l^{\infty}$度量的初始数据的“连续依赖”的意义上的封闭性。最显著的相关性的分析结果是,小振幅的解决方案的Ablowitz-Ladik系统坚持在离散非线性薛定谔之一。结果表明,封闭性的结果也是有效的,在高维晶格以及广义非线性。为了说明该方法的适用性,包括一个简短的数值研究,表明当1-孤子解的Ablowitz-Ladik系统中启动的离散非线性薛定谔系统的立方和饱和非线性,它持续了很长时间。从而获得了与理论预测非常吻合的数值结果。

英文摘要:

While the Ablowitz-Ladik lattice is integrable, the Discrete Nonlinear Schrödinger equation, which is more significant for physical applications, is not. We prove closeness of the solutions of both systems in the sense of a "continuous dependence" on their initial data in the $l^2$ and $l^{\infty}$ metrics. The most striking relevance of the analytical results is that small amplitude solutions of the Ablowitz-Ladik system persist in the Discrete Nonlinear Schrödinger one. It is shown that the closeness results are also valid in higher dimensional lattices as well as for generalised nonlinearities. For illustration of the applicability of the approach, a brief numerical study is included, showing that when the 1-soliton solution of the Ablowitz-Ladik system is initiated in the Discrete Nonlinear Schrödinger system with cubic and saturable nonlinearity, it persists for long-times. Thereby excellent agreement of the numerical findings with the theoretical predicti ions is obtained.

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。

↑