【摘要】 We propose a new multi-symplectic integration method for the nonlinear Schrodinger equation.The new scheme is derived by concatenating spatial discretization of the multi-symplectic Fourier pseudospectral method with temporal discretization of a symplectic Euler scheme and it is semi-exphcit in the sense that it does not need to solve the nonlinear algebraic equations at every time step.We verify that the multi-symplectic semi-discretization of the Schrodinger equation with periodic boundary conditions has N semi-discrete multi-symplectic conservation laws.The discretization in time of the semi-discretization leads to N full-discrete multi-symplectic conservation laws.Numerical results are presented to demonstrate the robustness and the stability.更多还原

【Abstract】 We propose a new multi-symplectic integration method for the nonlinear Schrodinger equation.The new scheme is derived by concatenating spatial discretization of the multi-symplectic Fourier pseudospectral method with temporal discretization of a symplectic Euler scheme and it is semi-exphcit in the sense that it does not need to solve the nonlinear algebraic equations at every time step.We verify that the multi-symplectic semi-discretization of the Schrodinger equation with periodic boundary conditions has N semi-discrete multi-symplectic conservation laws.The discretization in time of the semi-discretization leads to N full-discrete multi-symplectic conservation laws.Numerical results are presented to demonstrate the robustness and the stability.更多还原