Abstract
We compute the Gabor matrix for Schrödinger-type evolution operators. Precisely, we analyze the heat equation, already presented in Cordero et al. (Gabor representations of evolution operators, 2012), giving the exact expression of the Gabor matrix which leads to better numerical evaluations. Then, using asymptotic integration techniques, we obtain an upper bound for the Gabor matrix in one-dimension for the generalized heat equation, new in the literature. Using Maple software, we show numeric representations of the coefficients’ decay. Finally, we show the super-exponential decay of the coefficients of the Gabor matrix for the harmonic repulsor, together with some numerical evaluations. This work is the natural prosecution of the ideas presented in Cordero et al. (Gabor representations of evolution operators, 2012) and Cordero et al. (Sparsity of Gabor representation of Schrödinger propagators, Appl Comput Harmonic Appl 26:357–370, 2009).
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Acknowledgments
I am sincerely grateful to Professor E. Cordero for the fruitful discussion, valuable advices, constructive criticism and constant review of this work. I would like to thank Professors E. Cordero and L. Rodino for inspiring this paper. I also wish to thank M. Borsero for the useful suggestions, and the final review aimed at improving the readability of the paper. Finally, I am thankful for the enormous work of the anonymous reviewer who suggested important corrections that gave consistency to the paper.
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Berra, M. Gabor frame decomposition of evolution operators and applications. J. Pseudo-Differ. Oper. Appl. 5, 277–304 (2014). https://doi.org/10.1007/s11868-014-0090-8
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DOI: https://doi.org/10.1007/s11868-014-0090-8