The Hausdorff dimension of planar elliptic measures via quasiconformal mappings

Abstract

In this paper, we obtain new bounds for the Hausdorff dimension of planar elliptic measure via the application of quasiconformal mappings, with these bounds depending solely on the ellipticity constant of the matrix. In fact, in our case studies, we find a quasiconformal mapping that relates the elliptic measure in a domain to the harmonic measure in its image domain, allowing us to deduce bounds for the dimension of the elliptic measure from the known results on the harmonic side. This extends previous works of Makarov, Jones and Wolff.

Removed the CDC condition, thereby generalizing previous results: Theorem 1.3 unifies the former Theorems 1.3 and 1.7, and Theorem 1.4 strengthens the former Theorem 1.8. Introduction restructured to first present general results. Remaining theorems renumbered and sections reorganized accordingly. Updated references