Discrete Lagrangian reduction, discrete Euler-Poincare equations, and semidirect products

Details Discrete Lagrangian reduction, discrete Euler-Poincare equations, and semidirect products Discrete Lagrangian reduction, discrete Euler-Poincare equations, and semidirect products

1999-06-15

arxiv.org/abs/math/9906108v1

Lett. Math. Phys., 1999, V. 49, p.79-93.

Mathematics

Symplectic Geometry

16 pp., LaTeX

Scientific paper

A discrete version of Lagrangian reduction is developed in the context of discrete time Lagrangian systems on $G\times G$, where $G$ is a Lie group. We consider the case when the Lagrange function is invariant with respect to the action of an isotropy subgroup of a fixed element in the representation space of $G$. In this context the reduction of the discrete Euler-Lagrange equations is shown to lead to the so called discrete Euler-Poincar\'e equations. A constrained variational principle is derived. The Legendre transformation of the discrete Euler-Poincar\'e equations leads to discrete Hamiltonian (Lie-Poisson) systems on a dual space to a semiproduct Lie algebra.

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