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Volume 16, Issue 4
Novel High-Order Mass- and Energy-Conservative Runge-Kutta Integrators for the Regularized Logarithmic Schrödinger Equation

Xu Qian, Hong Zhang, Jingye Yan & Songhe Song

Numer. Math. Theor. Meth. Appl., 16 (2023), pp. 993-1012.

Published online: 2023-11

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  • Abstract

We develop a class of conservative integrators for the regularized logarithmic Schrödinger equation (RLogSE) using the quadratization technique and symplectic Runge-Kutta schemes. To preserve the highly nonlinear energy functional, the regularized equation is first transformed into an equivalent system that admits two quadratic invariants by adopting the invariant energy quadratization approach. The reformulation is then discretized using the Fourier pseudo-spectral method in the space direction, and integrated in the time direction by a class of diagonally implicit Runge-Kutta schemes that conserve both quadratic invariants to round-off errors. For comparison purposes, a class of multi-symplectic integrators are developed for RLogSE to conserve the multi-symplectic conservation law and global mass conservation law in the discrete level. Numerical experiments illustrate the convergence, efficiency, and conservative properties of the proposed methods.

  • AMS Subject Headings

35Q55, 65L06, 81Q05

  • Copyright

COPYRIGHT: © Global Science Press

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@Article{NMTMA-16-993, author = {Qian , XuZhang , HongYan , Jingye and Song , Songhe}, title = {Novel High-Order Mass- and Energy-Conservative Runge-Kutta Integrators for the Regularized Logarithmic Schrödinger Equation }, journal = {Numerical Mathematics: Theory, Methods and Applications}, year = {2023}, volume = {16}, number = {4}, pages = {993--1012}, abstract = {

We develop a class of conservative integrators for the regularized logarithmic Schrödinger equation (RLogSE) using the quadratization technique and symplectic Runge-Kutta schemes. To preserve the highly nonlinear energy functional, the regularized equation is first transformed into an equivalent system that admits two quadratic invariants by adopting the invariant energy quadratization approach. The reformulation is then discretized using the Fourier pseudo-spectral method in the space direction, and integrated in the time direction by a class of diagonally implicit Runge-Kutta schemes that conserve both quadratic invariants to round-off errors. For comparison purposes, a class of multi-symplectic integrators are developed for RLogSE to conserve the multi-symplectic conservation law and global mass conservation law in the discrete level. Numerical experiments illustrate the convergence, efficiency, and conservative properties of the proposed methods.

}, issn = {2079-7338}, doi = {https://doi.org/10.4208/nmtma.OA-2022-0185}, url = {http://global-sci.org/intro/article_detail/nmtma/22120.html} }
TY - JOUR T1 - Novel High-Order Mass- and Energy-Conservative Runge-Kutta Integrators for the Regularized Logarithmic Schrödinger Equation AU - Qian , Xu AU - Zhang , Hong AU - Yan , Jingye AU - Song , Songhe JO - Numerical Mathematics: Theory, Methods and Applications VL - 4 SP - 993 EP - 1012 PY - 2023 DA - 2023/11 SN - 16 DO - http://doi.org/10.4208/nmtma.OA-2022-0185 UR - https://global-sci.org/intro/article_detail/nmtma/22120.html KW - Regularized logarithmic Schrödinger equation, conservative numerical integrators, invariant energy quadratization approach, diagonally implicit Runge-Kutta scheme. AB -

We develop a class of conservative integrators for the regularized logarithmic Schrödinger equation (RLogSE) using the quadratization technique and symplectic Runge-Kutta schemes. To preserve the highly nonlinear energy functional, the regularized equation is first transformed into an equivalent system that admits two quadratic invariants by adopting the invariant energy quadratization approach. The reformulation is then discretized using the Fourier pseudo-spectral method in the space direction, and integrated in the time direction by a class of diagonally implicit Runge-Kutta schemes that conserve both quadratic invariants to round-off errors. For comparison purposes, a class of multi-symplectic integrators are developed for RLogSE to conserve the multi-symplectic conservation law and global mass conservation law in the discrete level. Numerical experiments illustrate the convergence, efficiency, and conservative properties of the proposed methods.

Qian , XuZhang , HongYan , Jingye and Song , Songhe. (2023). Novel High-Order Mass- and Energy-Conservative Runge-Kutta Integrators for the Regularized Logarithmic Schrödinger Equation . Numerical Mathematics: Theory, Methods and Applications. 16 (4). 993-1012. doi:10.4208/nmtma.OA-2022-0185
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