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EnglishThe arithmetics of the frequency and of the rotation number play a fundamental role in the study of reducibility of analytic quasiperiodic cocycles which are sufficiently close to a constant. In this paper we show how to generalize previous works by L.H. Eliasson which deal with the diophantine case so as to implement a Brjuno-Rüssmann arithmetical condition both on the frequency and on the rotation number. Our approach adapts the Pöschel-Rüssmann KAM method, which was previously used in the problem of linearization of vector fields, to the problem of reducing cocycles.
| Titolo: | Reducibility of quasiperiodic cocycles under a Brjuno-Rüssmann arithmetical condition |
| Autori: | |
| Data di pubblicazione: | 2012 |
| Rivista: | |
| Parole Chiave: | Quasiperiodic cocycle; reducibility; KAM method; Brjuno condition; diophantine condition |
| Digital Object Identifier (DOI): | http://dx.doi.org/10.3934/jmd.2012.6.59 |
| Handle: | http://hdl.handle.net/11384/4519 |
| Appare nelle tipologie: | 1.1 Articolo in rivista |
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