Null sets of harmonic measure on NTA domains: Lipschitz approximation revisited release_hca5sliesvgddg2cgjzx623uzy

by Matthew Badger

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2010  

Abstract

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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Date   2010-07-14
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Language   en ?
arXiv  1003.4547v2
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