Abstract
In this article, a unified approach to obtain symplectic integrators on \(T^{*}G\) from Lie group integrators on a Lie group \(G\) is presented. The approach is worked out in detail for symplectic integrators based on Runge–Kutta–Munthe-Kaas methods and Crouch–Grossman methods. These methods can be interpreted as symplectic partitioned Runge–Kutta methods extended to the Lie group setting in two different ways. In both cases, we show that it is possible to obtain symplectic integrators of arbitrarily high order by this approach.
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Notes
This group structure was used by Engø in [12] to construct partitioned Runge–Kutta–Munthe-Kaas methods on \(T^{*}G\), without any special regard to symplecticity.
Variational methods for degenerate Hamiltonian systems using Type II generating functions have been proposed by Leok and Zhang [14].
Since \(\hat{b}_i=b_i\) and the right-hand side is independent of \(S\), we could instead have grouped \(S\) with \(p\) without any change.
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Acknowledgments
We would like to thank our supervisor, Brynjulf Owren, for encouragement and many helpful discussions. We would also like to thank Klas Modin for fruitful discussions leading to the writing of this paper. Finally, we would like to thank the two anonymous referees for helpful comments and suggestions. The research was supported by the Research Council of Norway and by a Marie Curie International Research Staff Exchange Scheme Fellowship within the 7th European Community Framework Programme.
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Communicated by Arieh Iserles.
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Bogfjellmo, G., Marthinsen, H. High-Order Symplectic Partitioned Lie Group Methods. Found Comput Math 16, 493–530 (2016). https://doi.org/10.1007/s10208-015-9257-9
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DOI: https://doi.org/10.1007/s10208-015-9257-9