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Rolling sphere problems on spaces of constant curvature

Published online by Cambridge University Press:  01 May 2008

V. JURDJEVIC  and
J. ZIMMERMAN
V. JURDJEVIC
Affiliation:
Department of Mathematics, University of Toronto Toronto, Ontario, CanadaM5S 2E4. e-mail: [email protected], [email protected]
J. ZIMMERMAN
Affiliation:
Department of Mathematics, University of Toronto Toronto, Ontario, CanadaM5S 2E4. e-mail: [email protected], [email protected]
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Abstract

The rolling sphere problem on Euclidean space consists of determining the path of minimal length traced by the point of contact of the oriented unit sphere as it rolls on without slipping between two points of . This problem is extended to situations in which an oriented sphere of radius ρ rolls on a stationary sphere and to the hyperbolic analogue in which the spheres and are replaced by the hyperboloids and respectively. The notion of “rolling” is defined in an isometric sense: the length of the path traced by the point of contact is measured by the Riemannian metric of the stationary manifold, and the orientation of the rolling object is measured by a matrix in its isometry group. These rolling problems are formulated as left invariant optimal control problems on Lie groups whose Hamiltonian extremal equations reveal two remarkable facts: on the level of Lie algebras the extremal equations of all these rolling problems are governed by a single set of equations, and the projections onto the stationary manifold of the extremal equations having I4=0, where I4 is an integral of motion, coincide with the elastic curves on this manifold. The paper then outlines some explicit solutions based on the use of symmetries and the corresponding integrals of motion.

Type
Research Article
Information
Mathematical Proceedings of the Cambridge Philosophical Society , Volume 144 , Issue 3 , May 2008 , pp. 729 - 747
Copyright
Copyright © Cambridge Philosophical Society 2008

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