On dispersion of small energy solutions of the nonlinear Klein Gordon equation with a potential

Details On dispersion of small energy solutions of the nonlinear Klein Gordon equation with a potential On dispersion of small energy solutions of the nonlinear Klein Gordon equation with a potential

2009-08-31

arxiv.org/abs/0908.4548v2

Mathematics

Analysis of PDEs

Many small errors have been corrected

Scientific paper

In this paper we study small amplitude solutions of nonlinear Klein Gordon equations with a potential. Under smoothness and decay assumptions on the potential and a genericity assumption on the nonlinearity, we prove that all small amplitude initial data with finite energy give rise to solutions asymptotically free. In the case where the linear system has at most one bound state the result was already proved by Soffer and Weinstein: we obtain here a result valid in the case of an arbitrary number of possibly degenerate bound states. The proof is based on a combination of Birkhoff normal form techniques and dispersive estimates.

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