Summary
The analytic expression for a Riemannian metric on a 2-sphere, having integrable geodesic flow with an additional integral quadratic in momenta, is given in [Ko1]. We give the topological classification, up to topological equivalence of Liouville foliations, of all such metrics. The classification is computable, and the formula for calculating the complexity of the flow is straightforward. We prove Fomenko's conjecture that, from the point of view of complexity, the integrable geodesic flows with an additional integral linear or quadratic in momenta exhaust “almost all” integrable geodesic flows on the 2-dimensional sphere.
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Communicated by Jerrold Marsden
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Nguyen, T.Z., Polyakova, L.S. A topological classification of integrable geodesic flows on the two-dimensional sphere with an additional integral quadratic in the momenta. J Nonlinear Sci 3, 85–108 (1993). https://doi.org/10.1007/BF02429860
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DOI: https://doi.org/10.1007/BF02429860