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arXiv · 1304.4352

Boundary measures, generalized Gauss-Green formulas, and mean value property in metric measure spaces

Niko Marola·Michele Miranda Jr.·Nageswari Shanmugalingam
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Abstract

We study mean value properties of harmonic functions in metric measure spaces. The metric measure spaces we consider have a doubling measure and support a (1,1)- Poincaré inequality. The notion of harmonicity is based on the Dirichlet form defined in terms of a Cheeger differentiable structure. By studying fine properties of the Green function on balls, we characterize harmonic functions in terms of a mean value property. As a consequence, we obtain a detailed description of Poisson kernels. We shall also obtain a Gauss-Green type formula for sets of finite perimeter which posses a Minkowski content characterization of the perimeter. For the Gauss-Green formula we introduce a suitable notion of the interior normal trace of a regular ball.

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Niko Marola, Michele Miranda Jr., Nageswari Shanmugalingam. 2015-09-30. Boundary measures, generalized Gauss-Green formulas, and mean value property in metric measure spaces. https://doi.org/10.4171/rmi%2F843

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