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Propagation of Gevrey regularity over long times for the fully discrete Lie Trotter splitting schemeapplied to the linear Schrödinger equation

Published online by Cambridge University Press:  08 July 2009

François Castella  and
Guillaume Dujardin
François Castella
Affiliation:
RMAR & INRIA Rennes, Équipe IPSO, Campus de Beaulieu, Université de Rennes 1, 35042 Rennes Cedex, France. [email protected]
Guillaume Dujardin
Affiliation:
INRIA Rennes, Équipe IPSO, Antenne de Bretagne de l'École Normale Supérieure de Cachan, Avenue Robert Schumann, 35170 Bruz, France. [email protected]
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Abstract

In this paper, we studythe linear Schrödinger equation over the d-dimensional torus,with small values of the perturbing potential.We consider numerical approximations of the associated solutions obtainedby a symplectic splitting method (to discretize the time variable) in combination with the Fast Fourier Transform algorithm (to discretize the space variable).In this fully discrete setting, we prove that the regularity of the initialdatum is preserved over long times, i.e. times that are exponentially longwith the time discretization parameter. We here refer to Gevrey regularity, and our estimatesturn out to be uniform in the space discretization parameter.This paper extends [G. Dujardin and E. Faou, Numer. Math.97 (2004) 493–535], where a similar result has been obtained inthe semi-discrete situation, i.e. when the mere time variable is discretized and spaceis kept a continuous variable.

Keywords

SplittingKAM theoryresonancenormal formsGevrey regularitySchrödinger equation.
Type
Research Article
Information
ESAIM: Mathematical Modelling and Numerical Analysis , Volume 43 , Issue 4: Special issue on Numerical ODEs today , July 2009 , pp. 651 - 676
Copyright
© EDP Sciences, SMAI, 2009

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