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PreprintarXiv licencearXiv

A Note on Extended States on the Bethe Lattice

  • Vojkan Jaksic
  • Yoram Last
  • Simone Warzel
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Abstract

We give a new proof of the existence of absolutely continuous spectrum for the weakly disordered Anderson model on the Bethe lattice. The argument follows a general cyclicity criterion for Anderson-type Hamiltonians and reduces the problem to showing that the spectral measures of two independent copies of the rooted tree are not mutually singular. This is detected by their Hellinger affinity, and the required weak-disorder estimate follows from a short harmonic and compactness argument. We also formulate an analogous quantitative cyclicity criterion for the Anderson model on ℤd, expressed through the Schur complement of the Poisson transform of a 2×2 matrix spectral measure.

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Cite

BibTeXRIS
BibTeX
@misc{jaksic2026note,
  title = {{A Note on Extended States on the Bethe Lattice}},
  author = {Vojkan Jaksic and Yoram Last and Simone Warzel},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.06987},
  eprint = {2609.06987},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.06987},
}
RIS
TY  - UNPB
TI  - A Note on Extended States on the Bethe Lattice
AU  - Vojkan Jaksic
AU  - Yoram Last
AU  - Simone Warzel
PY  - 2026
DA  - 2026/09/07
PB  - arXiv
DO  - 10.48550/arxiv.2609.06987
UR  - https://arxiv.org/abs/2609.06987
AB  - We give a new proof of the existence of absolutely continuous spectrum for the weakly disordered Anderson model on the Bethe lattice. The argument follows a general cyclicity criterion for Anderson-type Hamiltonians and reduces the problem to showing that the spectral measures of two independent copies of the rooted tree are not mutually singular. This is detected by their Hellinger affinity, and the required weak-disorder estimate follows from a short harmonic and compactness argument. We also formulate an analogous quantitative cyclicity criterion for the Anderson model on ℤ^d, expressed through the Schur complement of the Poisson transform of a 2×2 matrix spectral measure.
ER  -