Diagonal Möbius–logarithmic Elliott–Halberstam conjecture

Let 0<θ<10<\theta<1 be fixed, let NN be a sufficiently large natural number, and let gg be either g(n)=μ(n)g(n)=\mu(n) or g(n)=μ(n)log⁡(n)g(n)=\mu(n)\log(n). Let Λ(n)\Lambda(n) and φ(q)\varphi(q) denote the von Mangoldt function and Euler totient function. Diagonal Möbius–logarithmic Elliott–Halberstam conjecture. For every A>0A>0,

∑q≤Nθ(N,q)=1∣∑n<N ≡Nmod⁡qΛ(n)g(N−n)−1φ(q)∑n<NΛ(n)g(N−n)∣≪ANlog⁡(N)A.\sum_{\substack{q\leq N^{\theta}\\(N,q)=1}}\left|\sum_{\substack{n<N\ \equiv N\,\operatorname{mod} q}}\Lambda(n)g(N-n)-\frac{1}{\varphi(q)}\sum_{n<N}\Lambda(n)g(N-n)\right|\ll_A\frac{N}{\log(N)^A}.

This is a diagonal, in some sense weaker, variant of the Möbius-twisted Elliott–Halberstam conjecture, tailored to the symmetric weighted averages studied in the paper. Its validity is open.

References

Primary source

Marco Cantarini, “Averages of diagonal Elliott-Halberstam problem twisted by Möbius function with Sobolev and Hölder-Zygmund weights”, arXiv:2607.09110 (2026).

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