Lower dimensional invariant tori with prescribed frequency for nonlinear wave equation

Lower dimensional invariant tori with prescribed frequency for nonlinear wave equation
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非线性波动方程具有规定频率的低维不变环面

DOI:
10.1016/j.jde.2010.04.003
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发表时间:
2010-12
影响因子:
2.4
通讯作者:
Geng, Jiansheng
Geng, Jiansheng
中科院分区:
数学2区
文献类型:
--
作者:
Ren, Xiufang;Geng, Jiansheng

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In this paper, one-dimensional (1D) nonlinear wave equation utt−uxx+mu+u3=0, subject to Dirichlet boundary conditions is considered. We show that for each given m>0, and each prescribed integer b>1, the above equation admits a Whitney smooth family of small-amplitude quasi-periodic solutions with b-dimensional Diophantine frequencies, which correspond to b-dimensional invariant tori of an associated infinite-dimensional dynamical system. In particular, these Diophantine frequencies are the small dilation of a prescribed Diophantine vector. The proof is based on a partial Birkhoff normal form reduction and an improved KAM method.
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