Quadrics on complex Riemannian spaces of constant curvature, separation of variables, and the Gaudin magnet
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Copyright 1994 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in the Journal of Mathematical Physics and may be found at http://jmp.aip.org/jmp/top.jsp
Abstract
Integrable systems that are connected with orthogonal separation of variables in complex Riemannian spaces of constant curvature are considered herein. An isomorphism with the hyperbolic Gaudin magnet, previously pointed out by one of the authors, extends to coordinates of this type. The complete classification of these separable coordinate systems is provided by means of the corresponding L matrices for the Gaudin magnet. The limiting procedures (or calculus) which relate various degenerate orthogonal coordinate systems play a crucial role in the classification of all such systems.
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Kalnins, E.G., Kuznetsov, V.B. & Miller, W., Jr. (1994). Quadrics on complex Riemannian spaces of constant curvature, separation of variables, and the Gaudin magnet. Journal of Mathematical Physics, 35, 1710.