Fourier decay of equilibrium states and the Fibonacci Hamiltonian
Fuente:
arXiv
Saved in:
| Main Author: | |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866909714093178880 |
|---|---|
| author | Leclerc, Gaétan |
| author_facet | Leclerc, Gaétan |
| contents | We show positivity of the lower Fourier dimension for equilibrium states of nonlinear, area preserving, Axiom A diffeomorphisms on surfaces. To do so, we use the sum-product phenomenon to reduce Fourier decay to the study of some temporal distance function for a well chosen suspension flow, whose mixing properties reflects the nonlinearity of our base dynamics. We then generalize in an Axiom A setting the methods of Tsujii-Zhang, dealing with exponential mixing of three-dimensional Anosov flows arXiv:2006.04293. The nonlinearity condition is generic and can be checked in concrete contexts. As a corollary, we prove power Fourier decay for the density of states measure of the Fibonacci Hamiltonian, which is related to the measure of maximal entropy of the Fibonacci trace map. This proves positivity of the lower Fourier dimension for the spectrum of the Fibonacci Hamiltonian, and suggest strong phase-averaged dispersive estimates in quasicrystals. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2507_23731 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Fourier decay of equilibrium states and the Fibonacci Hamiltonian Leclerc, Gaétan Dynamical Systems Mathematical Physics Spectral Theory 37A46 (Primary), 37D35, 37D45, 81Q35 We show positivity of the lower Fourier dimension for equilibrium states of nonlinear, area preserving, Axiom A diffeomorphisms on surfaces. To do so, we use the sum-product phenomenon to reduce Fourier decay to the study of some temporal distance function for a well chosen suspension flow, whose mixing properties reflects the nonlinearity of our base dynamics. We then generalize in an Axiom A setting the methods of Tsujii-Zhang, dealing with exponential mixing of three-dimensional Anosov flows arXiv:2006.04293. The nonlinearity condition is generic and can be checked in concrete contexts. As a corollary, we prove power Fourier decay for the density of states measure of the Fibonacci Hamiltonian, which is related to the measure of maximal entropy of the Fibonacci trace map. This proves positivity of the lower Fourier dimension for the spectrum of the Fibonacci Hamiltonian, and suggest strong phase-averaged dispersive estimates in quasicrystals. |
| title | Fourier decay of equilibrium states and the Fibonacci Hamiltonian |
| topic | Dynamical Systems Mathematical Physics Spectral Theory 37A46 (Primary), 37D35, 37D45, 81Q35 |
| url | https://arxiv.org/abs/2507.23731 |