Ergodic averages of commuting transformations with distinct degree polynomial iterates

Details Ergodic averages of commuting transformations with distinct degree polynomial iterates Ergodic averages of commuting transformations with distinct degree polynomial iterates

2009-12-14

arxiv.org/abs/0912.2641v3

Mathematics

Dynamical Systems

44 pages, the title changed and a few other changes made in view of the referee's report. To appear in the Proceedings of the

Scientific paper

We prove mean convergence, as $N\to\infty$, for the multiple ergodic averages $\frac{1}{N}\sum_{n=1}^N f_1(T_1^{p_1(n)}x)... f_\ell(T_\ell^{p_\ell(n)}x)$, where $p_1,...,p_\ell$ are integer polynomials with distinct degrees, and $T_1,...,T_\ell$ are commuting, invertible measure preserving transformations, acting on the same probability space. This establishes several cases of a conjecture of Bergelson and Leibman, that complement the case of linear polynomials, recently established by Tao. Furthermore, we show that, unlike the case of linear polynomials, for polynomials of distinct degrees, the corresponding characteristic factors are mixtures of inverse limits of nilsystems. We use this particular structure, together with some equidistribution results on nilmanifolds, to give an application to multiple recurrence and a corresponding one to combinatorics.

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