# Minimal discs in hyperbolic space bounded by a quasicircle at infinity

### Andrea Seppi

Università degli Studi di Pavia, Italy

## Abstract

We prove that the supremum of principal curvatures of a minimal embedded disc in hyperbolic three-space spanning a quasicircle in the boundary at infinity is estimated in a sublinear way by the norm of the quasicircle in the sense of universal Teichmüller space, if the quasicircle is sufficiently close to being the boundary of a totally geodesic plane. As a by-product we prove that there is a universal constant C independent of the genus such that if the Teichmüller distance between the ends of a quasi-Fuchsian manifold $M$ is at most C, then $M$ is almost-Fuchsian. The main ingredients of the proofs are estimates on the convex hull of a minimal surface and Schauder-type estimates to control principal curvatures.

## Cite this article

Andrea Seppi, Minimal discs in hyperbolic space bounded by a quasicircle at infinity. Comment. Math. Helv. 91 (2016), no. 4, pp. 807–839

DOI 10.4171/CMH/403