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• W3176331313 abstract "Two exponential wave integrator Fourier pseudospectral (EWI-FP) methods are presented and analyzed for the long-time dynamics of the Dirac equation with small potentials characterized by $varepsilon in (0, 1]$ a dimensionless parameter. Based on the (symmetric) exponential wave integrator for temporal derivatives in phase space followed by applying the Fourier pseudospectral discretization for spatial derivatives, the EWI-FP methods are explicit and of spectral accuracy in space and second-order accuracy in time for any fixed $varepsilon = varepsilon_0$. Uniform error bounds are rigorously carried out at $O(h^{m_0}+tau^2)$ up to the time at $O(1/varepsilon)$ with the mesh size $h$, time step $tau$ and $m_0$ an integer depending on the regularity of the solution. Extensive numerical results are reported to confirm our error bounds and comparisons of two methods are shown. Finally, dynamics of the Dirac equation in 2D are presented to validate the numerical schemes." @default.
• W3176331313 created "2021-07-05" @default.
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• W3176331313 date "2021-06-26" @default.
• W3176331313 modified "2023-10-18" @default.
• W3176331313 title "Uniform error bounds of exponential wave integrator methods for the long-time dynamics of the Dirac equation with small potentials" @default.
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• W3176331313 doi "https://doi.org/10.48550/arxiv.2106.14107" @default.
• W3176331313 hasPublicationYear "2021" @default.
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