Regularity in a one-phase free boundary problem for the fractional Laplacian

preprint2011arXivOpen access

Abstract

For a one-phase free boundary problem involving a fractional Laplacian, we prove that "flat free boundaries" are C1,αC^{1,α}. We recover the regularity results of Caffarelli for viscosity solutions of the classical Bernoulli-type free boundary problem with the standard Laplacian.

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