Metric density results for the value distribution of Sudler products

Research output: Other contribution

Abstract

We study the value distribution of the Sudler product $P_N(\alpha) := \prod_{n=1}^{N}\lvert2\sin(\pi n \alpha)\rvert$ for Lebesgue-almost every irrational $\alpha$. We show that for every non-decreasing function \\\mbox{$\psi: (0,\infty) \to (0,\infty)$} with $\sum_{k=1}^{\infty} \frac{1}{\psi(k)} = \infty$, the
set $\{N \in \mathbb{N}: \log P_N(\alpha) \leq -\psi(\log N)\}$ has upper density $1$, which answers a question of Bence Borda.
On the other hand, we prove that $\{N \in \mathbb{N}: \log P_N(\alpha) \geq \psi(\log N)\}$ has upper density at least $\frac{1}{2}$, with remarkable equality if $\liminf_{k \to \infty} \psi(k)/(k \log k) \geq C$ for some sufficiently large $C > 0$.
\end{abstract}
Original languageEnglish
Number of pages13
DOIs
Publication statusAccepted/In press - 28 Sep 2022

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