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arXiv · 2607.24169

Supersolution Construction and Optimal Hardy Inequality for Fractional Laplacians

Philipp Hake·Matthias Keller·Felix Pogorzelski
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Abstract

We give a new criterion to show optimality of Hardy weights for general operators on graphs via the supersolution construction. For Laplacians on graphs without killing terms this always gives rise to an optimal Hardy weight via the Green's function without any further assumptions. Furthermore, in contrast to earlier results, our result is not restricted to locally finite graphs. This allows us in particular to obtain optimal Hardy weights for the fractional Laplacian on general graphs. For the fractional Laplacian on the Euclidean lattice, we then obtain an optimal Hardy weight with the constant and asymptotics as it is expected from the continuous setting.

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Philipp Hake, Matthias Keller, Felix Pogorzelski. 2026-07-27. Supersolution Construction and Optimal Hardy Inequality for Fractional Laplacians. https://arxiv.org/abs/2607.24169

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