Tao's nilmanifold formulation of the logarithmic Sarnak conjecture

Let sNs\in\mathbb{N}, let G/ΓG/\Gamma be an ss-step nilmanifold, where GG is a connected, simply connected ss-step nilpotent Lie group and Γ\Gamma is a cocompact discrete subgroup, let F:G/ΓCF:G/\Gamma\to\mathbb{C} be Lipschitz-continuous, and let x0G/Γx_0\in G/\Gamma. For gGg\in G and hNh\in\mathbb{N}, write ghx0g^h x_0 for the induced action on the nilmanifold. Tao's nilmanifold conjecture. One has

limH+lim supN+EnNlogsupgGEhHμ(n+h)F(ghx0)=0.\lim_{H\to+\infty}\limsup_{N\to+\infty}\mathbb{E}^{\operatorname{log}}_{n\leq N}\sup_{g\in G}\left|\mathbb{E}_{h\leq H}\mu(n+h)F(g^h x_0)\right|=0.

Tao's result identifies this nilmanifold statement as equivalent to the logarithmic Sarnak conjecture. The paper uses this formulation to connect logarithmic Möbius disjointness with polynomial complexity; the general assertion remains open.

Sources & referencesView supporting material

Primary source

Wen Huang, Leiye Xu and Xiangdong Ye, “Polynomial mean complexity and Logarithmic Sarnak conjecture”, arXiv:2009.02090 (2020).

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