Invariant manifolds around soliton manifolds for the nonlinear Klein-Gordon equation

Details Invariant manifolds around soliton manifolds for the nonlinear Klein-Gordon equation Invariant manifolds around soliton manifolds for the nonlinear Klein-Gordon equation

2011-02-28

arxiv.org/abs/1102.5583v1

Mathematics

Analysis of PDEs

38 pages

Scientific paper

We construct center-stable and center-unstable manifolds, as well as stable and unstable manifolds, for the nonlinear Klein-Gordon equation with a focusing energy sub-critical nonlinearity, associated with a family of solitary waves which is generated from any radial stationary solution by the action of all Lorentz transforms and spatial translations. The construction is based on the graph transform (or Hadamard) approach, which requires less spectral information on the linearized operator, and less decay of the nonlinearity, than the Lyapunov-Perron method employed previously in this context. The only assumption on the stationary solution is that the kernel of the linearized operator is spanned by its spatial derivatives, which is known to hold for the ground states. The main novelty of this paper lies with the fact that the graph transform method is carried out in the presence of modulation parameters corresponding to the symmetries.

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