Brownian motion, random walks on trees, and harmonic measure on polynomial Julia sets

Details Brownian motion, random walks on trees, and harmonic measure on polynomial Julia sets Brownian motion, random walks on trees, and harmonic measure on polynomial Julia sets

2006-09-04

arxiv.org/abs/math/0609044v2

Mathematics

Dynamical Systems

15 pages, 5 figures. Revised 9/12/06

Scientific paper

We consider the harmonic measure on a disconnected polynomial Julia set in terms of Brownian motion. We show that the harmonic measure of any connected component of such a Julia set is zero. Associated to the polynomial is a combinatorial model, the tree with dynamics. We define a measure on the tree, which is a combinatorial version on harmonic measure. We show that this measure is isomorphic to the harmonic measure on the Julia set. The measure induces a random walk on the tree, which is isomorphic to Brownian motion in the plane.

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