Resonant normal form for even periodic FPU chains

Details Resonant normal form for even periodic FPU chains Resonant normal form for even periodic FPU chains

2007-09-17

arxiv.org/abs/0709.2624v1

Nonlinear Sciences

Exactly Solvable and Integrable Systems

34 pages, 3 figures

Scientific paper

In this paper we investigate periodic FPU chains with an even number of particles. We show that near the equilibrium point, any such chain admits a \emph{resonant} Birkhoff normal form of order four which is \emph{completely integrable} - an important fact which helps explain the numerical experiments of Fermi, Pasta, and Ulam. We analyze the moment map of the integrable approximation of an even FPU chain. Unlike in the case of odd FPU chains these integrable systems (generically) exhibit hyperbolic dynamics. As an application we prove that any FPU chain with Dirichlet boundary conditions admits a Birkhoff normal form up to order four and show that a KAM theorem applies.

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