Markov extensions and lifting measures for complex polynomials

Details Markov extensions and lifting measures for complex polynomials Markov extensions and lifting measures for complex polynomials

2005-07-26

arxiv.org/abs/math/0507543v2

Ergodic Theory Dynam. Systems 27 (2007) 743-768

Mathematics

Dynamical Systems

Some changes have been made, in particular to Sections 2 and 3, to clarify the exposition. Typos have been corrected and refer

Scientific paper

For polynomials $f$ on the complex plane with a dendrite Julia set we study invariant probability measures, obtained from a reference measure. To do this we follow Keller in constructing canonical Markov extensions. We discuss ``liftability'' of measures (both $f$-invariant and non-invariant) to the Markov extension, showing that invariant measures are liftable if and only if they have a positive Lyapunov exponent. We also show that $\delta$-conformal measure is liftable if and only if the set of points with positive Lyapunov exponent has positive measure.

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