Regularity of stable capillary minimal hypersurfaces

Abstract

We develop a regularity and compactness theory for stable capillary minimal hypersurfaces in the half-space $\mathbb{H}^{n+1}$ with contact angle $θ\in (0,π)$ and dimension $n \geq 2$. One key analytic ingredient is a capillary differential Schoen inequality, which allows us to establish a boundary sheeting theorem in the spirit of Bellettini. The other ingredient is a refined classification of stable capillary minimal cones, and we show that for any contact angle $θ\in(0,π)$, the stable capillary minimal hypercone in $\mathbb H^5$ with an isolated singularity must be flat. As a consequence, for any $n\leq4$ and $θ\in(0,π)$, we obtain the Bernstein theorem for embedded complete stable capillary minimal hypersurfaces in $\mathbb H^{n+1}$ with Euclidean area growth.