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- W4281572145 abstract "It has been recently understood that the harmonic measure on the boundary $E = partial Omega$ of a domain $Omega$ in $mathbb{R}^n$ is absolutely continuous with respect to the Hausdorff measure $mathcal{H}^{n - 1}$ on $E$ if and only if the boundary $E$ is rectifiable. Then, by G. David, M. Engelstein, J. Feneuil, S. Mayboroda and other coauthors, a notion of harmonic measure for Ahlfors-regular sets $E$ of higher codimension $n - d$ was developed with the aid of the operator $L_alpha = -mbox{div} D_{alpha}^{-n + d + alpha} nabla$, where $alpha > 0$ and $D_alpha$ is a certain regularized distance function to the set $E$. A program was launched to establish analogous to the classical case equivalence between rectifiability of the higher-codimensional set $E$ and good relations of the (new) harmonic and Hausdorff measures. The sufficiency of rectifiability for quantitative absolute continuity was only just obtained. For the other direction the main obstacle is to prove that, roughly, the equation $L_alpha D_alpha = 0$ is true only when the set $E$ is a hyperplane. In this paper we prove some first results which indicate that the latter conjecture may be true. We also explain that a certain natural strategy to tackle the problem does not work till the end." @default.
- W4281572145 created "2022-05-27" @default.
- W4281572145 creator A5003556974 @default.
- W4281572145 date "2022-05-23" @default.
- W4281572145 modified "2023-09-26" @default.
- W4281572145 title "On an obstacle to the converse of Dahlberg's theorem in high codimensions" @default.
- W4281572145 doi "https://doi.org/10.48550/arxiv.2205.11661" @default.
- W4281572145 hasPublicationYear "2022" @default.
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