English

Sign changes of the partial sums of a random multiplicative function II

Number Theory 2024-01-26 v3 Probability

Abstract

We study two models of random multiplicative functions: Rademacher random multiplicative functions supported on the squarefree integers ff, and Rademacher random completely multiplicative functions ff^*. We prove that the partial sums nxf(n)\sum_{n\leq x}f^*(n) and nxf(n)n\sum_{n\leq x}\frac{f(n)}{\sqrt{n}} change sign infinitely often as xx\to\infty, almost surely. The case nxf(n)n\sum_{n\leq x}\frac{f^*(n)}{\sqrt{n}} is left as an open question and we stress the possibility of only a finite number of sign changes, with positive probability.

Keywords

Cite

@article{arxiv.2303.14682,
  title  = {Sign changes of the partial sums of a random multiplicative function II},
  author = {Marco Aymone},
  journal= {arXiv preprint arXiv:2303.14682},
  year   = {2024}
}

Comments

8 pages, to appear in Compte Rendus Math\'ematique