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Skew product cycles with rich dynamics: From totally non-hyperbolic dynamics to fully prevalent hyperbolicity

机译:具有丰富动态的偏斜产品周期:从完全非双曲动力学到完全流行的双曲

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摘要

We introduce a two-parameter family of 'partially hyperbolic' skew products (G_(a,t))_(a>0,t∈[-ε,ε]) maps with one dimensional centre direction. In this family, the parameter a models the central dynamics and the parameter t the unfolding of cycles (that occurs for t = 0). The parameter a also measures the 'central distortion' of the systems: for small a, the distortion of the systems is small and it increases and goes to infinity as a → ∞. The family (G_(a,t)) displays some of the main characteristic properties of the unfolding of heterodimensional cycles as intermingled homoclinic classes of different indices and secondary bifurcations via collision of hyperbolic homoclinic classes. For a ∈ (0, log 2), the dynamics of (G_(a,t)) is always non-hyperbolic after the unfolding of the cycle. However, for a > log 4 intervals of t-parameters corresponding to hyperbolic dynamics appear and turn into totally prevalent as a → ∞ (the density of 'hyperbolic parameters' goes to 1 as a → ∞). The dynamics of the maps G_(a,t) is described using a family of iterated function systems modelling the dynamics in the one-dimensional central direction.
机译:我们引入了带有一维中心方向的“局部双曲”偏积(G_(a,t))_(a> 0,t∈[-ε,ε])映射的两参数族。在该族中,参数a为中心动力学建模,参数t为周期展开(在t = 0时发生)。参数a还可以测量系统的“中心畸变”:对于a而言,系统的畸变很小,并且随着a→∞的增加而增大并达到无穷大。族(G_(a,t))显示出不同维数循环展开的一些主要特征,它们是不同指数的同宿类混合在一起,并且通过双曲同宿类的碰撞产生了二次分支。对于∈(0,log 2),(G_(a,t))的动力学在循环展开后总是非双曲线的。但是,对于> log 4的与双曲线动力学相对应的t参数间隔出现并以a→∞变成完全普遍(“双曲线参数”的密度以a→∞变为1)。映射G_(a,t)的动力学是使用一族迭代函数系统描述的,该迭代函数系统对一维中心方向的动力学建模。

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