# Markov extensions and lifting measures for complex polynomials

Research paper by Henk Bruin, Mike Todd

Indexed on: 16 Oct '06Published on: 16 Oct '06Published in: Mathematics - Dynamical Systems

#### Abstract

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.