Exact Hausdorff measure on the boundary of a Galton--Watson tree

Details Exact Hausdorff measure on the boundary of a Galton--Watson tree Exact Hausdorff measure on the boundary of a Galton--Watson tree

2007-07-30

arxiv.org/abs/0707.4358v1

Annals of Probability 2007, Vol. 35, No. 3, 1007-1038

Mathematics

Probability

Published at http://dx.doi.org/10.1214/009117906000000629 in the Annals of Probability (http://www.imstat.org/aop/) by the Ins

Scientific paper

10.1214/009117906000000629

A necessary and sufficient condition for the almost sure existence of an absolutely continuous (with respect to the branching measure) exact Hausdorff measure on the boundary of a Galton--Watson tree is obtained. In the case where the absolutely continuous exact Hausdorff measure does not exist almost surely, a criterion which classifies gauge functions $\phi$ according to whether $\phi$-Hausdorff measure of the boundary minus a certain exceptional set is zero or infinity is given. Important examples are discussed in four additional theorems. In particular, Hawkes's conjecture in 1981 is solved. Problems of determining the exact local dimension of the branching measure at a typical point of the boundary are also solved.

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