English

Oscillations of random multiplicative functions under initial bias

Number Theory 2026-03-25 v2 Probability

Abstract

We prove that if ff is a random completely multiplicative function, conditional f(p)=1f(p)=1 for each prime p(logx)2ϵp \le (\log x)^{2-\epsilon}, the probability that 1nNf(n)0\sum_{1\le n \le N}f(n)\ge 0 for all NxN\le x is o(1)o(1) as xx \rightarrow \infty. This solves a conjecture of Kucheriaviy, who has a complementary result showing this exponent is sharp. We also prove that almost surely the partial sums of f(n)n\sum\frac{f(n)}{\sqrt{n}} change signs infinitely many times, solving a problem of Aymone.

Keywords

Cite

@article{arxiv.2411.14447,
  title  = {Oscillations of random multiplicative functions under initial bias},
  author = {Rodrigo Angelo and Max Wenqiang Xu},
  journal= {arXiv preprint arXiv:2411.14447},
  year   = {2026}
}
R2 v1 2026-06-28T20:08:15.637Z