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arXiv 0906.2563math.DSmath.GT
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非经典区间交换的动力学

Dynamics of Non-Classical Interval Exchanges

Vaibhav S Gadre

摘要:

区间交换映射的一个自然推广是线性对合,首先由Danthony和Nogueira提出。具有单个道岔的递归训练轨道提供线性对合的子类。我们称这种线性对合为非经典区间交换。它们与可定向平面上的测量叶理有关。非经典区间交换可以作为一个动力系统来研究,在这种情况下考虑Rauzy归纳法。这给出了一个类似于Kerckhoff单纯系统的参数空间上的精化过程。我们表明,细化过程中给出了一个扩展,有一个关键的动力学属性称为{ \it均匀失真}。我们利用一致畸变证明了展开式的正规性。因此,我们证明了Keane猜想的一个类比:几乎每个非经典区间交换是唯一遍历的。Avila-Resistance独立证明了均匀失真。

英文摘要:

A natural generalization of interval exchange maps are linear involutions, first introduced by Danthony and Nogueira. Recurrent train tracks with a single switch provide a subclass of linear involutions. We call such linear involutions non-classical interval exchanges. They are related to measured foliations on orientable flat surfaces. Non-classical interval exchanges can be studied as a dynamical system by considering Rauzy induction in this context. This gives a refinement process on the parameter space similar to Kerckhoff's simplicial systems. We show that the refinement process gives an expansion that has a key dynamical property called {\it uniform distortion}. We use uniform distortion to prove normality of the expansion. Consequently, we prove an analog of Keane's conjecture: almost every non-classical interval exchange is uniquely ergodic. Uniform distortion has been independently shown by Avila-Resende.

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