Abstract
This chapter presents symplectic and symmetric composition methods based on Adapted Runge–Kutta–Nyström (ARKN) and extended Runge–Kutta–Nyström (ERKN) integrators for solving multi-frequency and multi-dimensional oscillatory Hamiltonian systems with the Hamiltonian \(H(p,q)=\dfrac{1}{2}p^{\intercal }p+\dfrac{1}{2}q^{\intercal }Kq+U(q)\), where \(p=q'\) and K is a symmetric and positive semi-definite matrix. We first consider the symplecticity conditions for multi-frequency and multi-dimensional ARKN integrators. We then analyse the symplecticity of the adjoint integrators of the multi-frequency and multi-dimensional symplectic ARKN and ERKN integrators, respectively. On the basis of the theoretical analysis, and using the idea of composition methods, we derive four new high-order symplectic and symmetric integrators. The numerical results quantitatively show the advantage and efficiency of the high-order symplectic and symmetric integrators.
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Wu, X., Wang, B. (2018). High-Order Symplectic and Symmetric Composition Integrators for Multi-frequency Oscillatory Hamiltonian Systems. In: Recent Developments in Structure-Preserving Algorithms for Oscillatory Differential Equations. Springer, Singapore. https://doi.org/10.1007/978-981-10-9004-2_5
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DOI: https://doi.org/10.1007/978-981-10-9004-2_5
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