A set Ω ⊂ Rd is said to be spectral if the space L2(Ω) admits an orthogonal basis of exponential functions. Fuglede (1974) conjectured that Ω is spectral if and only if it can tile the space by translations. While this conjecture was disproved for general sets, it was recently proved that the Fuglede conjecture does hold for the class of convex bodies in Rd . The proof was based on a new geometric necessary condition for spectrality, called “weak tiling”. In this paper we study further properties of the weak tiling notion, and present applications to convex bodies, non-convex polytopes, product domains and Cantor sets of positive measure.
|Journal||Sampling Theory, Signal Processing, and Data Analysis|
|State||Published - Dec 2023|
Bibliographical noteFunding Information:
M.K. was supported by the Hellenic Foundation for Research and Innovation, Project HFRI-FM17-1733 and by University of Crete Grant 4725. N.L. was supported by ISF Grant No. 1044/21 and ERC Starting Grant No. 713927. M.M. was supported by NKFIH Grants K129335 and K132097
© 2023, The Author(s), under exclusive licence to Springer Nature Switzerland AG.
- Fuglede’s conjecture
- Spectral set