Quasiconformal extensions to space of Weierstrass-Enneper lifts |
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Authors: | M Chuaqui P Duren B Osgood |
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Institution: | 1.P. Universidad Católica de Chile,Santiago,Chile;2.University of Michigan,Ann Arbor,USA;3.Stanford University,Stanford,USA |
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Abstract: | The Ahlfors-Weill extension of a conformal mapping of the disk is generalized to the Weierstrass-Enneper lift of a harmonic mapping of the disk to a minimal surface, producing homeomorphic and quasiconformal extensions to space. The extension is defined through the family of best Möbius approximations to the lift applied to a bundle of euclidean circles orthogonal to the disk. Extension of the planar harmonic map is also obtained subject to additional assumptions on the dilatation. The hypotheses involve bounds on a generalized Schwarzian derivative for harmonic mappings in terms of the hyperbolic metric of the disk and the Gaussian curvature of the minimal surface. Hyperbolic convexity plays a crucial role. |
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