Lifting measures to Markov extensions

Lifting measures to Markov extensions
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DOI:
10.1007/bf01308670
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发表时间:
1989-06
期刊:
Monatshefte für Mathematik
影响因子:
--
通讯作者:
G. Keller
G. Keller
中科院分区:
其他
文献类型:
--
作者:
G. Keller

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推广了Hofbauer(1979)的一个定理,给出了分段可逆动力系统的不变测度提升为Markov扩张的条件.利用这些结果,我们证明了:(1)如果T是一个具有吸引不变Cantor集的S-单峰映射,则T是一个具有吸引不变Cantor集的S-单峰映射,则T是一个具有吸引不变Cantor集的S-单峰映射|T′| dμ=0,对于康托集上的唯一不变测度μ。(2)若T是分段可逆的,且f是T关于σ-有限测度的Radon-Nikodym导数,若logf在T下有界失真,且μ是遍历T不变测度,满足其熵的某个下估计,则μ ∈ miffhμ(T)= μ logfd μ.
Generalizing a theorem ofHofbauer(1979), we give conditions under which invariant measures for piecewise invertible dynamical systems can be lifted to Markov extensions. Using these results we prove:(1)IfTis anS-unimodal map with an attracting invariant Cantor set, then ∫log|T′|dμ=0 for the unique invariant measure μ on the Cantor set.(2)IfTis piecewise invertible, iffis the Radon-Nikodym derivative ofTwith respect to a σ-finite measurem, if logfhas bounded distortion underT, and if μ is an ergodicT-invariant measure satisfying a certain lower estimate for its entropy, then μ≪miffhμ(T)=Σlogf dμ.