Une propriété de transfert en approximation diophantienne

Abstract

Given a vector $\omega \in {\mathbb{R}}^n$,the sequence $T_i$ of periods is defined as the sequence of times of best returns near the origin of the translation $x⟼x+\omega$ on the torus ${\mathbb{T}}^n$. In the present paper, we study how the Diophantine properties of $\omega$ can be expressed considering the sequence of its periods. More precisely, we prove that, if the vector $\omega$ is not resonant,and if the sequence of periods satisfy the inequality$T_{i+1}\le C{T}_i^{1+\tau }$ with$\tau <(n-1{)}^{-1}$, then the vector $\omega$ is Diophantine.

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