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On the Maximum Curvature of Closed Curves in Negatively Curved Manifolds

Published online by Cambridge University Press:  20 November 2018

Simon Brendle
Affiliation:
Department of Mathematics, Stanford University, 450 Serra Mall, Bldg 380, Stanford, CA 94305 e-mail: [email protected]@stanford.edu
Otis Chodosh
Affiliation:
Department of Mathematics, Stanford University, 450 Serra Mall, Bldg 380, Stanford, CA 94305 e-mail: [email protected]@stanford.edu
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Abstract

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Motivated by Almgren’s work on the isoperimetric inequality, we prove a sharp inequality relating the length and maximum curvature of a closed curve in a complete, simply connected manifold of sectional curvature at most −1. Moreover, if equality holds, then the norm of the geodesic curvature is constant and the torsion vanishes. The proof involves an application of the maximum principle to a function defined on pairs of points.

Type
Research Article
Copyright
Copyright © Canadian Mathematical Society 2015

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