Multiple recurence and convergence for sequences related to the prime numbers

Details Multiple recurence and convergence for sequences related to the prime numbers Multiple recurence and convergence for sequences related to the prime numbers

2006-07-25

arxiv.org/abs/math/0607637v1

Mathematics

Dynamical Systems

14 pages. To appear in Crelle's Journal

Scientific paper

For any measure preserving system $(X,\mathcal{X},\mu,T)$ and $A\in\mathcal{X}$ with $\mu(A)>0$, we show that there exist infinitely many primes $p$ such that $\mu\bigl(A\cap T^{-(p-1)}A\cap T^{-2(p-1)}A\bigr) > 0$ (the same holds with $p-1$ replaced by $p+1$). Furthermore, we show the existence of the limit in $L^2(\mu)$ of the associated ergodic average over the primes. A key ingredient is a recent result of Green and Tao on the von Mangoldt function. A combinatorial consequence is that every subset of the integers with positive upper density contains an arithmetic progression of length three and common difference of the form $p-1$ (or $p+1$) for some prime $p$.

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