Null sets of harmonic measure on NTA domains: Lipschitz approximation revisited

Details Null sets of harmonic measure on NTA domains: Lipschitz approximation revisited Null sets of harmonic measure on NTA domains: Lipschitz approximation revisited

2010-03-23

arxiv.org/abs/1003.4547v3

Math. Z. 270 (2012), 241-262

Mathematics

Classical Analysis and ODEs

22 pages, 6 figures

Scientific paper

10.1007/s00209-010-0795-1

We show the David-Jerison construction of big pieces of Lipschitz graphs inside a corkscrew domain does not require its surface measure be upper Ahlfors regular. Thus we can study absolute continuity of harmonic measure and surface measure on NTA domains of locally finite perimeter using Lipschitz approximations. A partial analogue of the F. and M. Riesz Theorem for simply connected planar domains is obtained for NTA domains in space. As a consequence every Wolff snowflake has infinite surface measure.

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