Computer Validation of Open Gaps for the Almost Mathieu Operator with Critical Coupling
Fuente:
arXiv
Enregistré dans:
| Auteurs principaux: | , |
|---|---|
| Format: | Preprint |
| Publié: |
2024
|
| Sujets: | |
| Accès en ligne: | |
| Tags: |
Ajouter un tag
Pas de tags, Soyez le premier à ajouter un tag!
|
| _version_ | 1866909821814439936 |
|---|---|
| author | Figueras, Jordi-Lluís Puig, Joaquim |
| author_facet | Figueras, Jordi-Lluís Puig, Joaquim |
| contents | We present some computer assisted methods to prove the existence of spectral gaps for the Almost Mathieu operator at critical coupling and give rigorous numerical estimates on their size. As an example we show that the first 8 gaps predicted by the Gap Labelling theorem are open when $ω=(\sqrt{5}-1)/2$ and 12 of them are open when $ω=e-2$. A dynamical method based on the constructive conjugation to a hyperbolic cocycle and a spectral method based on the rigorous computation of the eigenvalues of finite-dimensional matrices are presented. We also present some experiments and conjectures on gap size for the associated peridodic problems. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_18536 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Computer Validation of Open Gaps for the Almost Mathieu Operator with Critical Coupling Figueras, Jordi-Lluís Puig, Joaquim Dynamical Systems 4L40, 37C55, 65G30 We present some computer assisted methods to prove the existence of spectral gaps for the Almost Mathieu operator at critical coupling and give rigorous numerical estimates on their size. As an example we show that the first 8 gaps predicted by the Gap Labelling theorem are open when $ω=(\sqrt{5}-1)/2$ and 12 of them are open when $ω=e-2$. A dynamical method based on the constructive conjugation to a hyperbolic cocycle and a spectral method based on the rigorous computation of the eigenvalues of finite-dimensional matrices are presented. We also present some experiments and conjectures on gap size for the associated peridodic problems. |
| title | Computer Validation of Open Gaps for the Almost Mathieu Operator with Critical Coupling |
| topic | Dynamical Systems 4L40, 37C55, 65G30 |
| url | https://arxiv.org/abs/2410.18536 |