Geodesic
Classification of singularities in the problem of motion of the Kovalevskaya top in a double force field
Sbornik. Mathematics, Tome 203 (2012) no. 2, pp. 257-287 Cet article a éte moissonné depuis la source Math-Net.Ru

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The problem of motion of the Kovalevskaya top in a double force field is investigated (the integrable case of A. G. Reyman and M. A. Semenov-Tian-Shansky without a gyrostatic momentum). It is a completely integrable Hamiltonian system with three degrees of freedom not reducible to a family of systems with two degrees of freedom. The critical set of the integral map is studied. The critical subsystems and bifurcation diagrams are described. The classification of all nondegenerate critical points is given. The set of these points consists of equilibria (nondegenerate singularities of rank 0), of singular periodic motions (nondegenerate singularities of rank 1), and also of critical two-frequency motions (nondegenerate singularities of rank 2). Bibliography: 32 titles.
Keywords: singularities of integrable Hamiltonian systems, momentum map, bifurcation diagram. 
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P. E. Ryabov; M. P. Kharlamov. Classification of singularities in the problem of motion of the Kovalevskaya top in a double force field. Sbornik. Mathematics, Tome 203 (2012) no. 2, pp. 257-287. http://geodesic.mathdoc.fr/item/SM_2012_203_2_a5/

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