arXivDaily arXiv每日学术速递 周一至周五更新
arXiv math/0609026math.AP
收藏

非线性Schroedinger方程小周期波的稳定性

Stability of small periodic waves for the nonlinear Schroedinger equation

Thierry Gallay, Mariana Haragus

摘要:

非线性薛定谔方程具有三个不同的六参数族的复值准周期行波,一个在散焦的情况下,两个在聚焦的情况下。所有这些解都具有这样的性质:对于某个实c,它们的模是x-ct的周期函数。在本文中,我们研究的小振幅行波的稳定性,在散焦和聚焦的情况下。我们的第一个结果表明,这些波是轨道稳定的类的解决方案,具有相同的周期和相同的Floquet指数的原始波。接下来,我们考虑一般的有界扰动,并专注于谱稳定性。我们证明了小振幅行波在散焦情况下是稳定的,而在聚焦情况下是不稳定的。不稳定性是边带型的,因此在用于分析轨道稳定性的周期性装置中无法检测到。

英文摘要:

The nonlinear Schroedinger equation possesses three distinct six-parameter families of complex-valued quasi-periodic travelling waves, one in the defocusing case and two in the focusing case. All these solutions have the property that their modulus is a periodic function of x-ct for some real c. In this paper we investigate the stability of the small amplitude travelling waves, both in the defocusing and the focusing case. Our first result shows that these waves are orbitally stable within the class of solutions which have the same period and the same Floquet exponent as the original wave. Next, we consider general bounded perturbations and focus on spectral stability. We show that the small amplitude travelling waves are stable in the defocusing case, but unstable in the focusing case. The instability is of side-band type, and therefore cannot be detected in the periodic set-up used for the analysis of orbital stability.

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。

↑