Explicit, time-reversible and symplectic integrator for Hamiltonians in isotropic uniformly curved geometries

04/22/2021

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by   Ana Silva, et al.

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The kinetic term of the N-body Hamiltonian system defined on the surface of the sphere is non-separable. As a result, standard explicit symplectic integrators are inapplicable. We exploit an underlying hierarchy in the structure of the kinetic term to construct an explicit time-reversible symplectic scheme of second order. We use iterative applications of the method to construct a fourth order scheme and demonstrate its efficiency.