弱混沌系统的度量复杂性
A "metric" complexity for weakly chaotic systems
摘要:
我们考虑了覆盖相空间的大测度子集所需的Bowen集的数目。本文介绍了一些表征不同类型(弱)混沌动力学的复杂性指标。由于在许多系统中,它的值是由一种局部熵给出的,因此计算该指标非常简单。我们给出了一些非平凡系统的计算例子(例如区间交换,分段等距)。以及一个类似于Ruelle-Pesin公式的公式,将复杂性指标与一些起正李雅普诺夫指数作用的初始条件敏感性指标联系起来。
英文摘要:
We consider the number of Bowen sets which are necessary to cover a large measure subset of the phase space. This introduce some complexity indicator characterizing different kind of (weakly) chaotic dynamics. Since in many systems its value is given by a sort of local entropy, this indicator is quite simple to be calculated. We give some example of calculation in nontrivial systems (interval exchanges, piecewise isometries e.g.) and a formula similar to the Ruelle-Pesin one, relating the complexity indicator to some initial condition sensitivity indicators playing the role of positive Lyapunov exponents.
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