Computer Validation of Open Gaps for the Almost Mathieu Operator with Critical Coupling

Autor:	Figueras, Jordi-Lluís, Puig, Joaquim
Rok vydání:	2024
Předmět:	Mathematics - Dynamical Systems 4L40 37C55 65G30
Druh dokumentu:	Working Paper
Popis:	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 $\omega=(\sqrt{5}-1)/2$ and 12 of them are open when $\omega=e-2$. 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. Comment: 20 pages, 7 figures
Databáze:	arXiv
Externí odkaz:	http://arxiv.org/abs/2410.18536 Zobrazit plný text záznamu View this record from Arxiv