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arXiv 2301.08009math.AP
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具有Sobolev光滑快驱动势的线性wave equation的约化

Reducibility for a linear wave equation with Sobolev smooth fast driven potential

Luca Franzoi

摘要:

证明了一维环面上具有时间拟周期驱动的线性波动方程的一个约化结果。驱动被假定为快速振荡,但不一定是小尺寸的。假设外部频率矢量足够大,并且从大测量的康托尔集中选择,则原始方程共轭为与时间无关的块对角方程。本文将以前的工作\cite{FM19}推广到更一般的假设:我们用Sobolev函数代替解析正则性;薛定谔算子中的势函数是一个非平凡的光滑函数而不是常值函数.实现这一结果的关键工具是薛定谔算子的每个本征函数接近指数子空间的局部化性质,并从后者多项式衰减。

英文摘要:

We prove a reducibility result for a linear wave equation with a time quasi-periodic driving on the one dimensional torus. The driving is assumed to be fast oscillating, but not necessarily of small size. Provided that the external frequency vector is sufficiently large and chosen from a Cantor set of large measure, the original equation is conjugated to a time-independent, block-diagonal one. With the present paper we extend the previous work \cite{FM19} to more general assumptions: we replace the analytic regularity in time with Sobolev one; the potential in the Schrödinger operator is a non-trivial smooth function instead of the constant one. The key tool to achieve the result is a localization property of each eigenfunction of the Schrödinger operator close to a subspace of exponentials, with a polynomial decay away from the latter.

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