No elliptic islands for the universal area-preserving map

Details No elliptic islands for the universal area-preserving map No elliptic islands for the universal area-preserving map

2010-12-10

arxiv.org/abs/1012.2409v2

Nonlinearity 24(7):2063-2078 (2011)

Mathematics

Dynamical Systems

Scientific paper

10.1088/0951-7715/24/7/008

A renormalization approach has been used in \cite{EKW1} and \cite{EKW2} to prove the existence of a \textit{universal area-preserving map}, a map with hyperbolic orbits of all binary periods. The existence of a horseshoe, with positive Hausdorff dimension, in its domain was demonstrated in \cite{GJ1}. In this paper the coexistence problem is studied, and a computer-aided proof is given that no elliptic islands with period less than 20 exist in the domain. It is also shown that less than 1.5% of the measure of the domain consists of elliptic islands. This is proven by showing that the measure of initial conditions that escape to infinity is at least 98.5% of the measure of the domain, and we conjecture that the escaping set has full measure. This is highly unexpected, since generically it is believed that for conservative systems hyperbolicity and ellipticity coexist.

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