Improved error estimates for splitting methods applied to highly-oscillatory nonlinear Schrödinger equations

Abstract : In this work, the error behavior of operator splitting methods is analyzed for highly-oscillatory differential equations. The scope of applications includes time-dependent nonlinear Schrödinger equations, where the evolution operator associated with the principal linear part is highly-oscillatory and periodic in time. In a first step, a known convergence result for the second-order Strang splitting method applied to the cubic Schrödinger equation is adapted to a wider class of nonlinearities. In a second step, the dependence of the global error on the decisive parameter 0 < ε < < 1, defining the length of the period, is examined. The main result states that, compared to established error estimates, the Strang splitting method is more accurate by a factor ε, provided that the time stepsize is chosen as an integer fraction of the period. This improved error behavior over a time interval of fixed length, which is independent of the period, is due to an averaging effect. The extension of the convergence result to higher-order splitting methods and numerical illustrations complement the investigations.
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Submitted on : Wednesday, September 28, 2016 - 2:27:57 PM
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Philippe Chartier, Florian Méhats, Mechthild Thalhammer, Yong Zhang. Improved error estimates for splitting methods applied to highly-oscillatory nonlinear Schrödinger equations. Mathematics of Computation, American Mathematical Society, 2016, 85 (302), pp.2863-2885. ⟨10.1090/mcom/3088⟩. ⟨hal-01373280⟩

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