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Norm resolvent convergence of discretized Fourier multipliers

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  • Horia Cornean, Aalborg University, Denmark
  • Henrik Garde
  • Arne Jensen, Aalborg University, Denmark

We prove norm estimates for the difference of resolvents of operators and their discrete counterparts, embedded into the continuum using biorthogonal Riesz sequences. The estimates are given in the operator norm for operators on square integrable functions, and depend explicitly on the mesh size for the discrete operators. The operators are a sum of a Fourier multiplier and a multiplicative potential. The Fourier multipliers include the fractional Laplacian and the pseudo-relativistic free Hamiltonian. The potentials are real, bounded, and Holder continuous. As a side-product, the Hausdorff distance between the spectra of the resolvents of the continuous and discrete operators decays with the same rate in the mesh size as for the norm resolvent estimates. The same result holds for the spectra of the original operators in a local Hausdorff distance.

Original languageEnglish
Article number71
JournalJournal of Fourier Analysis and Applications
Number of pages31
Publication statusPublished - Aug 2021

    Research areas

  • Norm resolvent convergence, Fourier multiplier, Lattice, Hausdorff distance

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