Alberto Farina, Enrico Valdinoci
We show that nonlocal minimal cones which are non-singular subgraphs outside the origin are necessarily halfspaces.
The proof is based on classical ideas of [14] and on the computation of the linearized nonlocal mean curvature operator, which is proved to satisfy a suitable maximum principle.
With this, we obtain new, and somehow simpler, proofs of the Bernsteintype results for nonlocal minimal surfaces which have been recently established in [20]. In addition, we establish a new nonlocal Bernstein-Moser-type result which classifies Lipschitz nonlocal minimal subgraphs outside a ball.
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