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arXiv 1410.2199math.DS
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膨胀和膨胀不定常动力学

Expanding and expansive time-dependent dynamics

Christoph Kawan

摘要:

本文研究由映射序列给出的不定常动力系统。对于由紧致黎曼流形M上的扩张C^2-映射所构造的系统,我们给出了度量和拓扑熵的计算公式。如果我们只假设映射是C^1,但以同样的方式作用在M的基本群上,我们可以证明自治系统的等共轭性的存在,这意味着熵的完全变分原理。最后,我们引入了强一致膨胀性的概念,推广了正膨胀性的经典概念,我们证明了一些著名的结果的不定常类似物。特别地,我们推广了Reddy的结果,该结果表明,一个正扩张系统在一个等价的度量中局部扩展距离。

英文摘要:

In this paper, time-dependent dynamical systems given by sequences of maps are studied. For systems built from expanding C^2-maps on a compact Riemannian manifold M with uniform bounds on expansion factors and derivatives, we provide formulas for the metric and topological entropy. If we only assume that the maps are C^1, but act in the same way on the fundamental group of M, we can show the existence of an equi-conjugacy to an autonomous system, implying a full variational principle for the entropy. Finally, we introduce the notion of strong uniform expansivity that generalizes the classical notion of positive expansivity, and we prove time-dependent analogues of some well-known results. In particular, we generalize Reddy's result which states that a positively expansive system locally expands distances in an equivalent metric.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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