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Quasi-periodic solutions for the forced Kirchhoff equation on $\mathbb{T}^d$ (1802.04139v1)
Published 8 Feb 2018 in math.AP
Abstract: In this paper we prove the existence of small-amplitude quasi-periodic solutions with Sobolev regularity, for the $d$-dimensional forced Kirchhoff equation with periodic boundary conditions. This is the first result of this type for a quasi-linear equations in high dimension. The proof is based on a Nash-Moser scheme in Sobolev class and a regularization procedure combined with a multiscale analysis in order to solve the linearized problem at any approximate solution.