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Research Article

Fourier uniqueness in even dimensions

View ORCID ProfileAndrew Bakan, View ORCID ProfileHaakan Hedenmalm, View ORCID ProfileAlfonso Montes-Rodríguez, View ORCID ProfileDanylo Radchenko, and Maryna Viazovska
  1. aInstitute of Mathematics, National Academy of Sciences of Ukraine, Kyiv 01601, Ukraine;
  2. bDepartment of Mathematics, KTH Royal Institute of Technology, S-10044 Stockholm, Sweden;
  3. cDepartment of Mathematical Analysis, University of Sevilla, ES-41004 Seville, Spain;
  4. dDepartment of Mathematics, Swiss Federal Institute of Technology Zürich (ETHZ), CH-8092 Zürich, Switzerland;
  5. eInstitute of Mathematics, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015 Lausanne, Switzerland

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PNAS April 13, 2021 118 (15) e2023227118; https://doi.org/10.1073/pnas.2023227118
Andrew Bakan
aInstitute of Mathematics, National Academy of Sciences of Ukraine, Kyiv 01601, Ukraine;
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  • ORCID record for Andrew Bakan
Haakan Hedenmalm
bDepartment of Mathematics, KTH Royal Institute of Technology, S-10044 Stockholm, Sweden;
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  • ORCID record for Haakan Hedenmalm
  • For correspondence: haakanh@kth.se
Alfonso Montes-Rodríguez
cDepartment of Mathematical Analysis, University of Sevilla, ES-41004 Seville, Spain;
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  • ORCID record for Alfonso Montes-Rodríguez
Danylo Radchenko
dDepartment of Mathematics, Swiss Federal Institute of Technology Zürich (ETHZ), CH-8092 Zürich, Switzerland;
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Maryna Viazovska
eInstitute of Mathematics, Swiss Federal Institute of Technology Lausanne (EPFL), CH-1015 Lausanne, Switzerland
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  1. Edited by Kenneth A. Ribet, University of California, Berkeley, CA, and approved February 24, 2021 (received for review November 7, 2020)

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Significance

We show an interrelation between the uniqueness aspect of the recent Fourier interpolation formula of D.R. and M.V. and the lattice-cross uniqueness set for the Klein–Gordon equation studied by H.H. and A.M.-R. With appropriate modifications, the approach applies in any even dimension ≥4 and is based on a sophisticated analysis of the iterates of a Gauss-type map.

Abstract

In recent work, methods from the theory of modular forms were used to obtain Fourier uniqueness results in several key dimensions (d=1,8,24), in which a function could be uniquely reconstructed from the values of it and its Fourier transform on a discrete set, with the striking application of resolving the sphere packing problem in dimensions d=8 and d=24. In this short note, we present an alternative approach to such results, viable in even dimensions, based instead on the uniqueness theory for the Klein–Gordon equation. Since the existing method for the Klein–Gordon uniqueness theory is based on the study of iterations of Gauss-type maps, this suggests a connection between the latter and methods involving modular forms. The derivation of Fourier uniqueness from the Klein–Gordon theory supplies conditions on the given test function for Fourier interpolation, which are hoped to be optimal or close to optimal.

  • Fourier transform
  • Fourier uniqueness
  • Heisenberg uniqueness pairs
  • Klein–Gordon equation

Footnotes

  • ↵1A.B., H.H., A.M.-R., D.R., and M.V. contributed equally to this work.

  • ↵2To whom correspondence may be addressed. Email: haakanh{at}kth.se.
  • Author contributions: A.B., H.H., A.M.-R., D.R., and M.V. performed research; and H.H. wrote the paper with contributions from all authors.

  • The authors declare no competing interest.

  • This article is a PNAS Direct Submission.

Data Availability

There are no data underlying this work.

Published under the PNAS license.

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References

  1. ↵
    1. H. Hedenmalm,
    2. A. Montes-Rodríguez
    , Heisenberg uniqueness pairs and the Klein-Gordon equation. Ann. Math. 173, 1507–1527 (2011).
    OpenUrl
  2. ↵
    1. H. Hedenmalm,
    2. A. Montes-Rodríguez
    , The Klein-Gordon equation, the Hilbert transform, and dynamics of Gauss-type maps. J. Eur. Math. Soc. 22, 1703–1757 (2020).
    OpenUrl
  3. ↵
    1. H. Hedenmalm,
    2. A. Montes-Rodríguez
    , The Klein-Gordon equation, the Hilbert transform, and Gauss-type maps: H∞ approximation. J. Anal. Math., in press.
  4. ↵
    1. D. Radchenko,
    2. M. Viazovska
    , Fourier interpolation on the real line. Publ. Math. Inst. Hautes Études Sci. 129, 51–81 (2019).
    OpenUrl
  5. ↵
    1. M. Viazovska
    , The sphere packing problem in dimension 8. Ann. Math. 185, 991–1015 (2017).
    OpenUrl
  6. ↵
    1. H. Cohn,
    2. A. Kumar,
    3. S. D. Miller,
    4. D. Radchenko,
    5. M. Viazovska
    , The sphere packing problem in dimension 24. Ann. Math. 185, 1017–1033 (2017).
    OpenUrl
  7. ↵
    1. M. Stoller
    , Fourier interpolation from spheres. arXiv:2002.11627 (26 February 2020).
  8. ↵
    1. H. Whitney
    , Differentiable even functions. Duke Math. J. 10, 159–160 (1943).
    OpenUrl
  9. ↵
    1. F. Canto-Martín,
    2. H. Hedenmalm,
    3. A. Montes-Rodlríguez
    , Perron-Frobenius operators and the Klein-Gordon equation. J. Eur. Math. Soc. 16, 31–66 (2014).
    OpenUrl

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Fourier uniqueness in even dimensions
Andrew Bakan, Haakan Hedenmalm, Alfonso Montes-Rodríguez, Danylo Radchenko, Maryna Viazovska
Proceedings of the National Academy of Sciences Apr 2021, 118 (15) e2023227118; DOI: 10.1073/pnas.2023227118

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Fourier uniqueness in even dimensions
Andrew Bakan, Haakan Hedenmalm, Alfonso Montes-Rodríguez, Danylo Radchenko, Maryna Viazovska
Proceedings of the National Academy of Sciences Apr 2021, 118 (15) e2023227118; DOI: 10.1073/pnas.2023227118
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Proceedings of the National Academy of Sciences: 118 (15)
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  • Article
    • Abstract
    • 1. Introduction
    • 2. Main Results
    • 3. Modifications in Higher Even Dimensions
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