Abstract
In a complete metric space equipped with a doubling measure supporting a p-Poincaré inequality, we prove sharp growth and integrability results for p-harmonic Green functions and their minimal p-weak upper gradients. We show that these properties are determined by the growth of the underlying measure near the singularity. Corresponding results are obtained also for more general p-harmonic functions with poles, as well as for singular solutions of elliptic differential equations in divergence form on weighted Rn and on manifolds.
The proofs are based on a new general capacity estimate for annuli, which implies precise pointwise estimates for p-harmonic Green functions. The capacity estimate is valid under considerably milder assumptions than above. We also use it, under these milder assumptions, to characterize singletons of zero capacity and the p-parabolicity of the space. This generalizes and improves earlier results that have been important especially in the context of Riemannian manifolds.
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Acknowledgement
A. B. and J. B. were supported by the Swedish Research Council, grants 2016-03424 resp., 621-2014-3974 and 2018-04106. Part of this research was done during several visits of J. L. to Linköping University; he is grateful for the support and hospitality.
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Björn, A., Björn, J. & Lehrbäck, J. Volume growth, capacity estimates, p-parabolicity and sharp integrability properties of p-harmonic Green functions. JAMA 150, 159–214 (2023). https://doi.org/10.1007/s11854-023-0273-4
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DOI: https://doi.org/10.1007/s11854-023-0273-4