Mathematics – Differential Geometry
Scientific paper
2007-11-08
Mathematics
Differential Geometry
10 pages; to appear in Geometric and Functional Analysis
Scientific paper
We construct a counterexample to a conjectured inequality L<2D, relating the diameter D and the least length L of a nontrivial closed geodesic, for a Riemannian metric on the 2-sphere. The construction relies on Guillemin's theorem concerning the existence of Zoll surfaces integrating an arbitrary infinitesimal odd deformation of the round metric. Thus the round metric is not optimal for the ratio L/D.
Balacheff Florent
Croke Christopher
Katz Mikhail G.
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