English

M\"obius disjointness conjecture for Furstenberg's flow on $\mathbb{T}^\omega$ in short intervals

Number Theory 2026-04-21 v1

Abstract

Furstenberg's flow on the infinite-dimensional torus Tω\mathbb{T}^\omega is defined by T(x1,x2,,xν,)=(x1+α,x2+h(x1),,xν+h(x1+(ν2)β),) T (x_1, x_2, \ldots, x_\nu, \ldots) = (x_1 + \alpha, x_2 + h(x_1), \ldots, x_\nu + h(x_1 + (\nu-2)\beta), \ldots) with αR\alpha\in \mathbb{R} satisfying certain diophantine conditions, βR\Q,\beta\in \mathbb{R}\backslash\mathbb{Q}, and h:RRh: \mathbb{R}\to \mathbb{R} being 11-periodic and analytic. This flow is irregular in the sense that its Birkhoff average does not exist for some xTωx\in \mathbb{T}^\omega, and it is a generalization of Furstenberg's irregular flow on T2\mathbb{T}^2. The main result of this paper is that the M\"{o}bius Disjointness Conjecture of Sarnak holds for the above flow (Tω,T)(\mathbb{T}^\omega, T) in short intervals (NM,N](N-M, N] with N5/8+εMNN^{5/8+\varepsilon} \leqslant M\leqslant N.

Keywords

Cite

@article{arxiv.2604.16840,
  title  = {M\"obius disjointness conjecture for Furstenberg's flow on $\mathbb{T}^\omega$ in short intervals},
  author = {Shuyang He and Qingyang Liu and Jing Ma},
  journal= {arXiv preprint arXiv:2604.16840},
  year   = {2026}
}