no. 2
Ergodic averages with deterministic weights
[Moyennes ergodiques pondérées par des poids déterministes]
Annales de l'Institut Fourier, Tome 52 (2002) no. 2, pp. 561-583.

Nous étudions la convergence de moyennes ergodiques 1 N∑ k=0 N-1 θ(k)f∘T u k où (θ(k)) k∈ℕ est une suite bornée et (u k ) k∈ℕ une suite d’entiers strictement croissante tels que Sup α∈ℝ |∑ k=0 N-1 θ(k) exp (2iπαu k )|=O(N δ ) avec δ<1. De plus nous donnons des exemples explicites de telles suites θ et u puis, nous nous intéressons aux cas où θ est une suite q- multiplicative.

We study the convergence of the ergodic averages 1 N∑ k=0 N-1 θ(k)f∘T u k where (θ(k)) k∈ℕ is a bounded sequence and (u k ) k∈ℕ a strictly increasing sequence of integers such that Sup α∈ℝ |∑ k=0 N-1 θ(k) exp (2iπαu k )|=O(N δ ) for some δ<1. Moreover we give explicit such sequences θ and u and we investigate in particular the case where θ is a q-multiplicative sequence.

DOI : https://doi.org/10.5802/aif.1894
Classification : 37A05,  28D05,  11K99
Mots clés : moyennes ergodiques pondérées, théorème ..., convergence presque sûre, suites multiplicatives q, suites substitutives, suite de Thue-Morse généralisées 
@article{AIF_2002__52_2_561_0,
     author = {Durand, Fabien and Schneider, Dominique},
     title = {Ergodic averages with deterministic weights},
     journal = {Annales de l'Institut Fourier},
     pages = {561--583},
     publisher = {Association des Annales de l{\textquoteright}institut Fourier},
     volume = {52},
     number = {2},
     year = {2002},
     doi = {10.5802/aif.1894},
     mrnumber = {1906483},
     zbl = {1054.37003},
     language = {en},
     url = {https://aif.centre-mersenne.org/articles/10.5802/aif.1894/}
}
Durand, Fabien; Schneider, Dominique. Ergodic averages with deterministic weights. Annales de l'Institut Fourier, Tome 52 (2002) no. 2, pp. 561-583. doi : 10.5802/aif.1894. https://aif.centre-mersenne.org/articles/10.5802/aif.1894/

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