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arXiv 1602.05093math.AP
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受迫Kirchoff方程的拟周期解

Quasi-periodic solutions of forced Kirchoff equation

Riccardo Montalto

摘要:

本文证明了具有周期边界条件的一维受迫Kirchoff方程具有Sobolev正则性的小振幅拟周期解的存在性和稳定性。这是关于拟线性波型方程的第一个KAM结果。主要困难是:$(i)$的最高阶导数的非线性,这不允许应用经典的KAM计划,$(ii)$的双共振的存在下,由于双重多重性的本征值的$- \partial_{xx}$。证明基于Sobolev类的Nash-Moser方案。主要讨论线性化算子在任意近似解处的可逆性及其逆算子在高Sobolev范数下的Tame估计的证明。为此,我们共轭的线性化运营商的$2 \times 2$,时间无关,块对角运营商。这是通过使用{ \it变量的变化}诱导的环面,{ \it伪微分}运营商和KAM { \it reduction}计划在Sobolev类。

英文摘要:

In this paper we prove the existence and the stability of small-amplitude quasi-periodic solutions with Sobolev regularity, for the 1-dimensional forced Kirchoff equation with periodic boundary conditions. This is the first KAM result for a quasi-linear wave-type equation. The main difficulties are: $(i)$ the presence of the highest order derivative in the nonlinearity which does not allow to apply the classical KAM scheme, $(ii)$ the presence of double resonances, due to the double multiplicity of the eigenvalues of $- \partial_{xx}$. The proof is based on a Nash-Moser scheme in Sobolev class. The main point concerns the invertibility of the linearized operator at any approximate solution and the proof of tame estimates for its inverse in high Sobolev norm. To this aim, we conjugate the linearized operator to a $2 \times 2$, time independent, block-diagonal operator. This is achieved by using {\it changes of variables} induced by diffeomorphisms of the torus, {\it pseudo-differential} operators and a KAM {\it reducibility} scheme in Sobolev class.

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