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arXiv 1806.01704math.AP
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一个快驱动线性Klein-Gordon方程的约化

Reducibility for a fast driven linear Klein-Gordon equation

Luca Franzoi, Alberto Maspero

摘要:

证明了紧区间上具有Dirichlet边界条件的拟周期驱动的线性Klein-Gordon方程的一个约化结果。没有对驱动的大小做任何假设,但是我们要求它快速振荡。特别是,提供的外部频率是足够大的,并从一个康托尔集的大措施选择,原来的方程共轭的时间无关,对角的。我们通过两个步骤实现这一结果。首先,我们进行了初步的转换,适应快速振荡系统,这使得原来的方程在微扰设置。然后,我们表明,这个新的方程可以把常数系数应用KAM约化方案,其收敛性需要一种新的类型的Melnikov条件。

英文摘要:

We prove a reducibility result for a linear Klein-Gordon equation with a quasi-periodic driving on a compact interval with Dirichlet boundary conditions. No assumptions are made on the size of the driving, however we require it to be fast oscillating. In particular, provided that the external frequency is sufficiently large and chosen from a Cantor set of large measure, the original equation is conjugated to a time independent, diagonal one. We achieve this result in two steps. First, we perform a preliminary transformation, adapted to fast oscillating systems, which puts the original equation in a perturbative setting. Then we show that this new equation can be put to constant coefficients by applying a KAM reducibility scheme, whose convergence requires a new type of Melnikov conditions.

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