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
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通讯作者:
G. Keller
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文献类型:
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作者:
G. Keller
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.