Dynamical and Topological methods in Theory of Geodesically Equivalent Metrics

Details Dynamical and Topological methods in Theory of Geodesically Equivalent Metrics Dynamical and Topological methods in Theory of Geodesically Equivalent Metrics

1999-11-09

arxiv.org/abs/math/9911054v1

Zap. Nauchn. Sem. S.-Peterburg. Otdel. Mat. Inst. Steklov. (POMI) 266 (2000), Teor. Predst. Din. Sist. Komb. i Algoritm. Metod

Mathematics

Differential Geometry

12 pages, LaTeX

Scientific paper

This paper is a review on recently found connection between geodesically equivalent metrics and integrable geodesic flows. Suppose two different metrics on one manifold have the same geodesics. We show that then the geodesic flows of these metrics admit sufficiently many integrals (of a special form) in involution and vice versa. The quantum version of this result is also true. As a corollary we have that the topology of the manifold (with two different metrics with the same geodesics) must be sufficiently simple. Also we have that the non-proportionality of the metrics at a point induces the non-proportionality of the metrics at almost all points.

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