Preprint

Inserted: 30 oct 2026
Last Updated: 30 oct 2026

Year: 2026

Abstract:

We prove that the first Dirichlet eigenvalue of the fractional Laplacian satisfies the sharp quantitative Faber-Krahn inequality. This was conjectured by Brasco, Cinti and Vita, who proved the inequality with a sub-optimal exponent. The proof adapts to the non-local setting the level-set argument recently introduced by Guerra, Machado and Ramos for the Laplacian. It is carried out on the horizontal level sets of the Caffarelli-Silvestre extension of the torsion function, where the asymmetry appears only as a boundary value at the corner of the extension variables.