Renormalization of Gevrey Vector Fields with a Brjuno Type Arithmetical Condition

João Lopes Dias and José Pedro Gaivão

No 2017/05, Working Papers REM from ISEG - Lisbon School of Economics and Management, REM, Universidade de Lisboa

Abstract: We show that in the Gevrey topology, ad-torus flow close enough to linear with a unique rotation vector ? is linearizable as long as ? satisfies a novel Brjuno type diophantine condition. The proof is based on the fast convergence under renormalization of the associated Gevrey vector field. It requires a multidimensional continued fractions expansion of ?, and the corresponding characterization of the Brjuno type vectors. This demonstrates that renormalization methods deal very naturally with Gevrey regularity expressed in the decay of Fourier coefficients. In particular, they provide new linearization results including frequencies beyond diophantine in non-analytic topologies.

Date: 2017-10
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Persistent link: https://EconPapers.repec.org/RePEc:ise:remwps:wp0052017

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