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arXiv 0905.1390math.DS
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倍周期保面积泛映射的动力学:双曲集

Dynamics of the Universal Area-Preserving Map Associated with Period Doubling: Hyperbolic Sets

Denis Gaidashev, Tomas Johnson

摘要:

众所周知,著名的Feigenbaum-Coullet-Tresser倍周期普适性对于${\fR}^2$的保面积映射有一个对应的普适性.重整化方法已被用于\cite{EKW1}和\cite{EKW2}在计算机辅助证明存在的“通用”面积保持地图$F_*$ -一个地图的轨道的所有二进制周期$2^k, k \in \fN$。本文考虑$F_*$中某些邻域内的映射,并研究它们的动力学性质。我们首先证明了映射$F_*$允许一个“双无限异宿缠结”:周期点序列$\{z_k\}$,$k \in \fZ$,|z_k| \converge{k \to \infty} 0,\quad |z_k| \converge{k \to -\infty} \infty,其稳定流形和不稳定流形横截相交;并且,对于任何$N \in \fN$,一个紧凑的不变集上$F_*$同胚的拓扑马尔可夫链的空间上的所有双边序列组成的$N$符号。这些结果的一个推论是{ \it无界}和{ \it振荡}轨道的存在。我们还表明,所有的地图接近$F_*$承认马蹄铁的第三个。我们使用失真工具提供严格的界限上的Hausdorff维数的相关的局部最大不变双曲集:$$ 0.7673 \ge {\rm dim}_H(\cC_F) \ge \varepsilon \approx 0.00044 e^{-1797}.$$

英文摘要:

It is known that the famous Feigenbaum-Coullet-Tresser period doubling universality has a counterpart for area-preserving maps of ${\fR}^2$. A renormalization approach has been used in \cite{EKW1} and \cite{EKW2} in a computer-assisted proof of existence of a "universal" area-preserving map $F_*$ -- a map with orbits of all binary periods $2^k, k \in \fN$. In this paper, we consider maps in some neighbourhood of $F_*$ and study their dynamics. We first demonstrate that the map $F_*$ admits a "bi-infinite heteroclinic tangle": a sequence of periodic points $\{z_k\}$, $k \in \fZ$, |z_k| \converge{k \to \infty} 0, \quad |z_k| \converge{k \to -\infty} \infty, whose stable and unstable manifolds intersect transversally; and, for any $N \in \fN$, a compact invariant set on which $F_*$ is homeomorphic to a topological Markov chain on the space of all two-sided sequences composed of $N$ symbols. A corollary of these results is the existence of {\it unbounded} and {\it oscillating} orbits. We also show that the third iterate for all maps close to $F_*$ admits a horseshoe. We use distortion tools to provide rigorous bounds on the Hausdorff dimension of the associated locally maximal invariant hyperbolic set: $$ 0.7673 \ge {\rm dim}_H(\cC_F) \ge \varepsilon \approx 0.00044 e^{-1797}.$$

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