Accepted Paper
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Inserted: 8 jan 2019
Last Updated: 11 nov 2026

Journal: J. Funct. Anal.
Pages: 36
Year: 2020

Abstract:

We prove a quantitative version of the Faber-Krahn inequality for the first eigenvalue of the fractional Dirichlet-Laplacian of order $s$. This is done by using the so-called Caffarelli-Silvestre extension and adapting to the nonlocal setting a trick by Hansen and Nadirashvili. The relevant stability estimate comes with an explicit constant, which is stable as the fractional order of differentiability goes to $1$.

Keywords: fractional Laplacian, Stability of eigenvalues

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