Rigorous numerics in Floquet theory: computing stable and unstable bundles of periodic orbits

Details Rigorous numerics in Floquet theory: computing stable and unstable bundles of periodic orbits Rigorous numerics in Floquet theory: computing stable and unstable bundles of periodic orbits

2011-12-20

arxiv.org/abs/1112.4874v1

Mathematics

Dynamical Systems

33 pages, 5 figures

Scientific paper

In this paper, a new rigorous numerical method to compute fundamental matrix solutions of non-autonomous linear differential equations with periodic coefficients is introduced. Decomposing the fundamental matrix solutions $\Phi(t)$ by their Floquet normal forms, that is as product of real periodic and exponential matrices $\Phi(t)=Q(t)e^{Rt}$, one solves simultaneously for $R$ and for the Fourier coefficients of $Q$ via a fixed point argument in a suitable Banach space of rapidly decaying coefficients. As an application, the method is used to compute rigorously stable and unstable bundles of periodic orbits of vector fields. Examples are given in the context of the Lorenz equations and the $\zeta^3$-model.

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