Nonlinear Sciences – Chaotic Dynamics
Scientific paper
2007-06-11
Nonlinear Sciences
Chaotic Dynamics
laTeX, 20 pages, 1 figure
Scientific paper
10.1016/j.physd.2007.08.014
We study the normal forms for incompressible flows and maps in the neighborhood of an equilibrium or fixed point with a triple eigenvalue. We prove that when a divergence free vector field in $\mathbb{R}^3$ has nilpotent linearization with maximal Jordan block then, to arbitrary degree, coordinates can be chosen so that the nonlinear terms occur as a single function of two variables in the third component. The analogue for volume-preserving diffeomorphisms gives an optimal normal form in which the truncation of the normal form at any degree gives an exactly volume-preserving map whose inverse is also polynomial inverse with the same degree.
Dullin Holger R.
Meiss James D.
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