English

Averages of diagonal Elliott-Halberstam problem twisted by Möbius function with Sobolev and Hölder-Zygmund weights

Number Theory 2026-07-10 v1

Abstract

Recalling that the so-called Elliott-Halberstam conjecture twisted by the M\"obius function μ(n)\mu(n) claims that qNθmaxyNmax(a,q)=1nynamodqΛ(n)μ(Nn)1φ(q)nyΛ(n)μ(Nn)Nlog(N)A \sum_{q\leq N^{\theta}}\max_{y\leq N}\max_{(a,q)=1}\left|\sum_{\underset{{\scriptstyle n\equiv a\,\mod\,q}}{n\leq y}}\Lambda(n)\mu\left(N-n\right)-\frac{1}{\varphi\left(q\right)}\sum_{n\leq y}\Lambda(n)\mu\left(N-n\right)\right|\ll\frac{N}{\log\left(N\right)^{A}} for every A>0A>0, where 0<θ<10<\theta<1 is fixed, and also recalling that the validity of this conjecture, in combination with the validity of the classical Elliott-Halberstam for suitable θ\theta, proves the binary Goldbach conjecture, in this paper we study weighted average variants of this problem. We will show that, under Generalized Riemann Hypothesis, a weak version of the Gonek-Hejhal conjecture and working with weights belonging to the Sobolev space W2,1W^{2,1} or in the H\"older-Zygmund spaces Cδ\mathcal{C}^{\delta} for suitable range of δ\delta, the bound of the average is consistent with the bound of the ``diagonal versions'' of this conjecture (that is, taking y=Ny=N and taking nNmodq)n\equiv N\mod q). In particular, in the case of weights in Sobolev space, the consistent upper bound holds for the whole 0<θ<10<\theta<1 and, in the case of weights in the H\"older-Zygmund class Cδ\mathcal{C}^{\delta}, for θ\theta that depends on the choice of δ\delta but still not below the 1/22ε1/2-2\varepsilon threshold.

Keywords

Cite

@article{arxiv.2607.09110,
  title  = {Averages of diagonal Elliott-Halberstam problem twisted by Möbius function with Sobolev and Hölder-Zygmund weights},
  author = {Marco Cantarini},
  journal= {arXiv preprint arXiv:2607.09110},
  year   = {2026}
}