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Transactions of the American Mathematical Society
Transactions of the American Mathematical Society
ISSN 1088-6850(online) ISSN 0002-9947(print)

Semidirect products and reduction in mechanics


Authors: Jerrold E. Marsden, Tudor Raţiu and Alan Weinstein
Journal: Trans. Amer. Math. Soc. 281 (1984), 147-177
MSC: Primary 58F05; Secondary 58G40, 70E15, 73C99, 76N99, 76W05, 78A99
MathSciNet review: 719663
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Abstract: This paper shows how to reduce a Hamiltonian system on the cotangent bundle of a Lie group to a Hamiltonian system in the dual of the Lie algebra of a semidirect product. The procedure simplifies, unifies, and extends work of Greene, Guillemin, Holm, Holmes, Kupershmidt, Marsden, Morrison, Ratiu, Sternberg and others. The heavy top, compressible fluids, magnetohydrodynamics, elasticity, the Maxwell-Vlasov equations and multifluid plasmas are presented as examples. Starting with Lagrangian variables, our method explains in a direct way why semidirect products occur so frequently in examples. It also provides a framework for the systematic introduction of Clebsch, or canonical, variables.


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Additional Information

DOI: http://dx.doi.org/10.1090/S0002-9947-1984-0719663-1
PII: S 0002-9947(1984)0719663-1
Article copyright: © Copyright 1984 American Mathematical Society