Continuous spectrum on laminations over Aubry-Mather sets

Details Continuous spectrum on laminations over Aubry-Mather sets Continuous spectrum on laminations over Aubry-Mather sets

2004-04-07

arxiv.org/abs/math/0404168v1

Mathematics

Dynamical Systems

Scientific paper

If we perturb a completely integrable Hamiltonian system with two degrees of freedom, the perturbed flow might display, on every energy level, invariant sets that are laminations over Aubry-Mather sets of a Poincar\'e section of the flow. Each one of these laminations carry a unique invariant probability measure for the flow on which mixing is impossible in this low dimensional frame. We prove that if the Aubry-Mather set has exactly one orbit of gaps and is hyperbolic then the special flow over it with any smooth ceiling function will be conjugate to a suspension with a constant ceiling function, failing hence to be weak mixing or even topologically weak mixing. To the contrary, if the Aubry-Mather set has more than one orbit of gaps with at least two in a general position then the special flow over it will in general be weak mixing.

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