Nonlocal minimal surfaces

Caffarelli, L. A.; Roquejoffre, J. -M.; Savin, O.

Nonlocal minimal surfaces

Authors

Caffarelli, L. A.

Roquejoffre, J. -M.

Savin, O.

Description

The de Giorgi theory for minimal surfaces consists in studying sets whose indicator function is a (local) minimum of the BV norm. In this paper we replace the BV norm by the $H^σ$ norm, with $σ<1/2$, and try to understand what the minimisers look like. Parallel to the de Giorgi theory we prove that, if the boundary of a minimiser is sufficiently flat in the unit ball, then it is a smooth piece of hypersurface.