English

Arbitrarily slow decay in the logarithmically averaged Sarnak conjecture

Dynamical Systems 2024-06-12 v1 Number Theory

Abstract

In 2017 Tao proposed a variant Sarnak's M\"{o}bius disjointness conjecture with logarithmic averaging: For any zero entropy dynamical system (X,T)(X,T), 1logNn=1Nf(Tnx)μ(n)n=o(1)\frac{1}{\log N} \sum_{n=1} ^N \frac{f(T^n x) \mu (n)}{n}= o(1) for every fC(X)f\in \mathcal{C}(X) and every xXx\in X. We construct examples showing that this o(1)o(1) can go to zero arbitrarily slowly. Nonetheless, all of our examples satisfy the conjecture.

Keywords

Cite

@article{arxiv.2406.06956,
  title  = {Arbitrarily slow decay in the logarithmically averaged Sarnak conjecture},
  author = {Amir Algom and Zhiren Wang},
  journal= {arXiv preprint arXiv:2406.06956},
  year   = {2024}
}

Comments

Preprint version, 12 pages. To appear in JMAA

R2 v1 2026-06-28T17:00:48.077Z