Uniform rectifiability and harmonic measure I: Uniform rectifiability implies Poisson kernels in $L^p$

Details Uniform rectifiability and harmonic measure I: Uniform rectifiability implies Poisson kernels in $L^p$ Uniform rectifiability and harmonic measure I: Uniform rectifiability implies Poisson kernels in $L^p$

2012-02-17

arxiv.org/abs/1202.3857v1

Mathematics

Classical Analysis and ODEs

Scientific paper

We present a higher dimensional, scale-invariant version of a classical theorem of F. and M. Riesz. More precisely, we establish scale invariant absolute continuity of harmonic measure with respect to surface measure, along with higher integrability of the Poisson kernel, for a domain $\Omega\subset \re^{n+1},\, n\geq 2$, with a uniformly rectifiable boundary, which satisfies the Harnack Chain condition plus an interior (but not exterior) corkscrew condition. In a companion paper to this one \cite{HMU}, we also establish a converse, in which we deduce uniform rectifiability of the boundary, assuming scale invariant $L^q$ bounds, with $q>1$, on the Poisson kernel.

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