DOI

We consider a difference operator acting in by the formula,, where,, and are parameters. This operator was introduced by P. Sarnak in 1982. For, the operator is quasiperiodic. Previously, within the framework of a renormalization approach (monodromization method), we described the location of the spectrum of this operator. In the present work, we first establish the existence of the point spectrum for different values of parameters, and then study the eigenfunctions. To do so, using ideas of the renormalization approach, we study the difference operator on the circle obtained from the original one by the Fourier transform. This allows us, first, to obtain a new type condition guaranteeing the existence of point spectrum and, second, to describe in detail a multi-scale self-similar structure of the Fourier transforms of the eigenfunctions. DOI 10.1134/S106192082403004X
Original languageEnglish
Pages (from-to)389-406
Number of pages18
JournalRussian Journal of Mathematical Physics
Volume31
Issue number3
DOIs
StatePublished - 1 Sep 2024

ID: 123004193