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arXiv 0802.4187math.DS
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环面同胚的有界平均运动概念

The concept of bounded mean motion for toral homeomorphisms

Tobias Jaeger

摘要:

两环面的保守无理伪旋转与无理旋转半共轭当且仅当它具有有界平均运动的性质[10]。(Here“无理伪旋转”表示具有唯一定义的完全无理旋转向量的环面同胚。本说明的目的是进一步探讨这一概念。例如,我们提供了一个例子,表明前面的陈述在非保守情况下不成立。此外,我们收集了一些意见的情况下,有界平均运动属性失败。特别地,我们证明了具有无界平均运动的双环面的非游荡无理伪旋转对初始条件具有敏感的依赖性。

英文摘要:

A conservative irrational pseudo-rotation of the two-torus is semi-conjugate to the irrational rotation if and only if it has the property of bounded mean motion [10]. (Here 'irrational pseudo-rotation' means a toral homeomorphism with uniquely defined, totally irrational rotation vector.) The aim of this note is to explore this concept some further. For instance, we provide an example which shows that the preceding statement does not hold in the non-conservative case. Further, we collect a number of observations concerning the case where the bounded mean motion property fails. In particular, we show that a non-wandering irrational pseudo-rotation of the two-torus with unbounded mean motion has sensitive dependence on initial conditions.

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