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arXiv 0704.0069math.DS
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上同调扩张映射的动力学对象

Dynamical Objects for Cohomologically Expanding Maps

John W. Robertson

摘要:

本文的目的是构造一个(不一定可逆)光滑自映射的紧致流形的不变动力对象。我们证明了一个结果,该结果利用层上同调长正合序列的膨胀率差异来创建序列中一项的有限维不变子空间到前一项的不变子空间的唯一提升。这使我们能够采取不变的上同调类,并在适当的情况下构造给定类型的唯一电流,包括给定类型的唯一度量,表示这些类,并且在回调下不变。一个动态有趣的自映射可能有过多的不变测度,所以构造的电流的连续性是很重要的。这意味着,如果局部增长与上同调类的增长率相比不是太大,那么扩展的上同调类会给系统足够的“行进命令”,以禁止任何其他相同类型的不变电流的形成(比如来自某个局部动力子系统)。因为我们使用子层的层的电流,我们给出的条件下,一个子层将有相同的上同调作为层包含它。使用一个平滑的参数,这使我们能够表明,层的上同调的电流正在考虑可以规范地确定与deRham上同调群。我们的主要定理可以应用于光滑和全纯的设置。

英文摘要:

The goal of this paper is to construct invariant dynamical objects for a (not necessarily invertible) smooth self map of a compact manifold. We prove a result that takes advantage of differences in rates of expansion in the terms of a sheaf cohomological long exact sequence to create unique lifts of finite dimensional invariant subspaces of one term of the sequence to invariant subspaces of the preceding term. This allows us to take invariant cohomological classes and under the right circumstances construct unique currents of a given type, including unique measures of a given type, that represent those classes and are invariant under pullback. A dynamically interesting self map may have a plethora of invariant measures, so the uniquess of the constructed currents is important. It means that if local growth is not too big compared to the growth rate of the cohomological class then the expanding cohomological class gives sufficient "marching orders" to the system to prohibit the formation of any other such invariant current of the same type (say from some local dynamical subsystem). Because we use subsheaves of the sheaf of currents we give conditions under which a subsheaf will have the same cohomology as the sheaf containing it. Using a smoothing argument this allows us to show that the sheaf cohomology of the currents under consideration can be canonically identified with the deRham cohomology groups. Our main theorem can be applied in both the smooth and holomorphic setting.

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