Multiple ergodic averages for three polynomials and applications

Details Multiple ergodic averages for three polynomials and applications Multiple ergodic averages for three polynomials and applications

2006-06-22

arxiv.org/abs/math/0606567v2

Mathematics

Dynamical Systems

47 pages, Final version to appear in the Trans. Amer. Math. Soc

Scientific paper

We find the smallest characteristic factor and a limit formula for the multiple ergodic averages associated to any family of three polynomials and polynomial families of the form $\{l_1p,l_2p,...,l_kp\}$. We then derive several multiple recurrence results and combinatorial implications, including an answer to a question of Brown, Graham, and Landman, and a generalization of the Polynomial Szemer\'edi Theorem of Bergelson and Leibman for families of three polynomials with not necessarily zero constant term. We also simplify and generalize a recent result of Bergelson, Host, and Kra, showing that for all $\epsilon>0$ and every subset of the integers $\Lambda$ the set $$ \big\{n\in\N\colon d^*\big(\Lambda\cap (\Lambda+p_1(n))\cap (\Lambda+p_2(n))\cap (\Lambda+ p_3(n))\big)>(d^*(\Lambda))^4-\epsilon\big\} $$ has bounded gaps for "most" choices of integer polynomials $p_1,p_2,p_3$.

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