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arXiv 0906.1806math.DS
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斜积同态的中间熵测度

Measures of Intermediate Entropies for Skew Product Diffeomorphisms

Peng Sun

摘要:

本文研究了具有正熵测度$μ$的斜积映射$F$.证明了如果纤维上的映射是具有非零李雅普诺夫指数的$C^{1+α}$同构,则$F$具有遍历的中间熵测度.为了构建这些措施,我们找到一个集上的返回地图是一个斜产品与马蹄沿纤维。我们可以控制平均返回时间,并表明这些措施的最大熵可以任意接近$h_μ(F)$。

英文摘要:

In this paper we study a skew product map $F$ with a measure $μ$ of positive entropy. We show that if on the fibers the map are $C^{1+α}$ diffeomorphisms with nonzero Lyapunov exponents, then $F$ has ergodic measures of intermediate entropies. To construct these measures we find a set on which the return map is a skew product with horseshoes along fibers. We can control the average return time and show the maximum entropy of these measures can be arbitrarily close to $h_μ(F)$.

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