We prove a posteriori error estimates of optimal order for linear Schrödinger-type equations in the L∞(L2)- and the L∞(H1)-norm. We discretize only in time by the Crank-Nicolson method. The direct use of the reconstruction technique, as it has been proposed by Akrivis et al. in [Math. Comput. 75 (2006) 511-531], leads to a posteriori upper bounds that are of optimal order in the L∞(L2)-norm, but of suboptimal order in the L∞(H1)-norm. The optimality in the case of L∞(H1)-norm is recovered by using an auxiliary initial- and boundary-value problem.
@article{M2AN_2011__45_4_761_0, author = {Kyza, Irene}, title = {A posteriori error analysis for the Crank-Nicolson method for linear Schr\"odinger equations}, journal = {ESAIM: Mathematical Modelling and Numerical Analysis - Mod\'elisation Math\'ematique et Analyse Num\'erique}, volume = {45}, year = {2011}, pages = {761-778}, doi = {10.1051/m2an/2010101}, zbl = {1269.65088}, language = {en}, url = {http://dml.mathdoc.fr/item/M2AN_2011__45_4_761_0} }
Kyza, Irene. A posteriori error analysis for the Crank-Nicolson method for linear Schrödinger equations. ESAIM: Mathematical Modelling and Numerical Analysis - Modélisation Mathématique et Analyse Numérique, Tome 45 (2011) pp. 761-778. doi : 10.1051/m2an/2010101. http://gdmltest.u-ga.fr/item/M2AN_2011__45_4_761_0/
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