Abstract
Hamiltonian PDEs have some invariant quantities, which would be good to conserve with the numerical integration. In this paper, we concentrate on the nonlinear wave and Schrödinger equations. Under hypotheses of regularity and periodicity, we study how a symmetric space discretization makes that the space discretized system also has some invariants or `nearly' invariants which well approximate the continuous ones. We conjecture some facts which would explain the good numerical approximation of them after time integration when using symplectic Runge-Kutta methods or symmetric linear multistep methods for second-order systems.
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Cano, B. Conserved quantities of some Hamiltonian wave equations after full discretization. Numer. Math. 103, 197–223 (2006). https://doi.org/10.1007/s00211-006-0680-3
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DOI: https://doi.org/10.1007/s00211-006-0680-3