Vol. 11, No. 7, 2018

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On $s$-harmonic functions on cones

Susanna Terracini, Giorgio Tortone and Stefano Vita

Vol. 11 (2018), No. 7, 1653–1691
Abstract

We deal with nonnegative functions satisfying

where $s\in \left(0,1\right)$ and $C$ is a given cone on ${ℝ}^{n}$ with vertex at zero. We consider the case when $s$ approaches $1$, wondering whether solutions of the problem do converge to harmonic functions in the same cone or not. Surprisingly, the answer will depend on the opening of the cone through an auxiliary eigenvalue problem on the upper half-sphere. These conic functions are involved in the study of the nodal regions in the case of optimal partitions and other free boundary problems and play a crucial role in the extension of the Alt–Caffarelli–Friedman monotonicity formula to the case of fractional diffusions.

Keywords
fractional Laplacian, conic functions, asymptotic behavior, Martin kernel
Mathematical Subject Classification 2010
Primary: 35R11
Secondary: 35B45, 35B08