Shifted Möbius Elliott–Halberstam conjecture

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Let 0<θ<10<\theta<1 be fixed, let h≠0h\neq0 be a fixed even integer, and let Λ(n)\Lambda(n), μ(n)\mu(n) and φ(q)\varphi(q) denote the von Mangoldt function, Möbius function and Euler totient function. Shifted Möbius Elliott–Halberstam conjecture. For every A>0A>0 and all sufficiently large natural numbers NN, one has

∑q≤Nθmax⁡y<Nmax⁡(a,q)=1∣∑n≤y ≡amod⁡qΛ(n)μ(n+h)−1φ(q)∑n≤yΛ(n)μ(n+h)∣≪ANlog⁡(N)A.\sum_{q\leq N^{\theta}}\max_{y<N}\max_{(a,q)=1}\left|\sum_{\substack{n\leq y\ \equiv a\,\operatorname{mod} q}}\Lambda(n)\mu(n+h)-\frac{1}{\varphi(q)}\sum_{n\leq y}\Lambda(n)\mu(n+h)\right|\ll_A\frac{N}{\log(N)^A}.

This is a Möbius-twisted analogue of Elliott–Halberstam intended to control cancellation on shifted primes. It is used with the classical conjecture in conditional results related to twin primes; the conjecture itself remains 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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