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arXiv 1304.4352math.APmath.MG
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度量测度空间中的边界测度、广义Gauss-Green公式和均值性质

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

Niko Marola, Michele Miranda, Nageswari Shanmugalingam

摘要:

研究了度量测度空间中调和函数的均值性质。我们考虑的度量测度空间具有一个加倍测度并支持一个(1,1)- Poincaré不等式。调和性的概念是基于狄利克雷形式定义的奇格微分结构。通过对球上格林函数的一些性质的研究,利用均值性质刻画了调和函数。因此,我们得到了详细的描述泊松核。我们还将得到有限周长集的Gauss-Green型公式,它是周长的Minkowski容度特征。对于高斯-格林公式,我们引入了一个适当的概念,一个正常的球的内部正常的轨迹。

英文摘要:

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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