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Spectral eigenvalue problem of Cantor measures and Artin's primitive root conjecture

Abstract

The eigenvalue problem for a probability measure μ with compact support in R is whether there exist a countable set Λ and a nonzero real t≠ 1 such that both Λ and tΛ are spectra of μ, that is, the family EaΛ={e−2πi aλx:λ∈Λ} is an orthonormal base for L2(μ) for a=1, t. The eigenvalue problem was discovered independently by Strichartz (Str00), Laba and Wang (LW02) for the Cantor measures μ4,{0,1} and μ6,{0,1,2}, respectively. In this paper, we investigate the spectral eigenvalue problem for the general spectral Cantor measure μb,𝒟. This topic is naturally related to elementary number theory. Unexpectedly, however, our main results depend on the theory of integers, especially Artin's primitive root conjecture. To some extent, our results suggest that Artin's primitive root conjecture may hold and confirms some viewpoints implied by Minkowski in (Min57).

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BibTeX
@misc{he2026spectral,
  title = {{Spectral eigenvalue problem of Cantor measures and Artin's primitive root conjecture}},
  author = {Xing-Gang He and Zhi-Yi Wu and Feng-Li Yin},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.29038},
  eprint = {2609.29038},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.29038},
}
RIS
TY  - UNPB
TI  - Spectral eigenvalue problem of Cantor measures and Artin's primitive root conjecture
AU  - Xing-Gang He
AU  - Zhi-Yi Wu
AU  - Feng-Li Yin
PY  - 2026
DA  - 2026/09/28
PB  - arXiv
DO  - 10.48550/arxiv.2609.29038
UR  - https://arxiv.org/abs/2609.29038
AB  - The eigenvalue problem for a probability measure μ with compact support in R is whether there exist a countable set Λ and a nonzero real t≠ 1 such that both Λ and tΛ are spectra of μ, that is, the family E_aΛ={e^−2πi aλx:λ∈Λ} is an orthonormal base for L^2(μ) for a=1, t. The eigenvalue problem was discovered independently by Strichartz (Str00), Laba and Wang (LW02) for the Cantor measures μ_4,{0,1} and μ_6,{0,1,2}, respectively. In this paper, we investigate the spectral eigenvalue problem for the general spectral Cantor measure μ_b,𝒟. This topic is naturally related to elementary number theory. Unexpectedly, however, our main results depend on the theory of integers, especially Artin's primitive root conjecture. To some extent, our results suggest that Artin's primitive root conjecture may hold and confirms some viewpoints implied by Minkowski in (Min57).
ER  -