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arXiv · 2408.15589

On the positivity of some weighted partial sums of a random multiplicative function

Marco Aymone
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Abstract

Inspired by the papers by Angelo and Xu, Q.J Math., 74, pp. 767-777, and improvements by Kerr and Klurman, arXiv:2211.05540, we study the probability that the weighted sums of a Rademacher random multiplicative function, $\sum_{n\leq x}f(n)n^{-σ}$, are positive for all $x\geq x_σ\geq 1$ in the regime $σ\to1/2^+$. In a previous paper by Heap, Zhao and the author, and by the author, when $0\leq σ\leq 1/2$ this probability is zero. Here we give a positive lower bound for this probability depending on $x_σ$ that becomes large as $σ\to1/2^+$. The main inputs in our proofs are a maximal inequality based in relatively high moments for these partial sums combined with a Bonami--Halász's moment inequality, and also explicit estimates for the partial sums of non-negative multiplicative functions.

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Marco Aymone. 2025-08-01. On the positivity of some weighted partial sums of a random multiplicative function. https://arxiv.org/abs/2408.15589

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