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arXiv 2012.05878math.AP
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随机扰动下NLS小基态的渐近稳定性

Asymptotic stability of small ground states for NLS under random perturbations

Nicolas Camps

摘要:

本文研究了短程势$V$扰动下欧几里得空间中的三次薛定谔方程. $-Δ+V$的一个负的简单本征值的存在下,产生了一个小的和本地化的非线性基态,产生一些已知是渐近稳定的能量空间中的时间周期的解决方案的曲线。我们研究了这些相干态在粗糙微扰下的持续性。我们将在能量空间以下构造一个大的小尺度超临界解的测度集,这些解显示出某些渐近稳定性行为。主要的困难是需要处理的调制方程中的本地化和色散项的相互作用。为此,我们使用一个临界加权的策略,结合概率非线性估计在临界空间的基础上$U^p, V^q$(控制高阶项)与一些本地的能量衰减估计(控制低阶项)。我们还回顾了在扰动设置的分析Bényi,哦和Pocovnicu的概率全局适定性和散射小超临界初始数据。我们使用一个扭曲的傅里叶变换和半经典的谓词演算推广概率和双线性的Eschhartz估计。

英文摘要:

We consider the cubic Schrödinger equation on the euclidean space perturbed by a short-range potential $V$. The presence of a negative simple eigenvalue for $-Δ+V$ gives rise to a curve of small and localized nonlinear ground states that yield some time-periodic solutions known to be asymptotically stable in the energy space. We study the persistence of these coherent states under rough perturbations. We shall construct a large measure set of small scaling-supercritical solutions below the energy space that display some asymptotic stability behavior. The main difficulty is the need to handle the interactions of localized and dispersive terms in the modulation equations. To do so, we use a critical-weighted strategy to combine probabilistic nonlinear estimates in critical spaces based on $U^p, V^q$ (controlling higher order terms) with some local energy decay estimates (controlling lower order terms). We also revisit in the perturbed setting the analysis of Bényi, Oh and Pocovnicu on the probabilistic global well-posedness and scattering for small supercritical initial data. We use a distorted Fourier transform and semiclassical functional calculus to generalize probabilistic and bilinear Strichartz estimates.

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