Pointwise convergence for cubic and polynomial ergodic averages of non-commuting transformations

Details Pointwise convergence for cubic and polynomial ergodic averages of non-commuting transformations Pointwise convergence for cubic and polynomial ergodic averages of non-commuting transformations

2010-06-27

arxiv.org/abs/1006.5239v2

Mathematics

Dynamical Systems

18 pages, changes suggested by the referee incorporated, to appear in Ergodic Theory and Dynamical Systems

Scientific paper

We study the limiting behavior of multiple ergodic averages involving several not necessarily commuting measure preserving transformations. We work on two types of averages, one that uses iterates along combinatorial parallelepipeds, and another that uses iterates along shifted polynomials. We prove pointwise convergence in both cases, thus answering a question of I.Assani in the former case, and extending results of B.Host-B.Kra and A.Leibman in the latter case. Our argument is based on some elementary uniformity estimates of general bounded sequences, decomposition results in ergodic theory, and equidistribution results on nilmanifolds.

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