Dual inhomogeneous Gallagher problem in higher dimensions

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Let k⩾2k\geqslant2 and let (α1,…,αk−1)∈Rk−1(\alpha_1,\ldots,\alpha_{k-1})\in\mathbb R^{k-1}. For n∈Zn\in\mathbb Z, define n+=max⁡(∣n∣,2)n^+=\max(|n|,2), and for n=(n1,…,nk)∈Zk\mathbf n=(n_1,\ldots,n_k)\in\mathbb Z^k define

H(n)=H(n1,…,nk)=n1+⋯nk+.H(\mathbf n)=H(n_1,\ldots,n_k)=n_1^+\cdots n_k^+.

Dual Gallagher problem. For almost all αk∈R\alpha_k\in\mathbb R, there exist infinitely many (n1,…,nk)∈Zk(n_1,\ldots,n_k)\in\mathbb Z^k such that

∥n1α1+⋯+nkαk∥<1H(n)(log⁡H(n))k.\|n_1\alpha_1+\cdots+n_k\alpha_k\|<\frac{1}{H(\mathbf n)(\log H(\mathbf n))^k}.

This is posed as a problem the authors intend to address in future work, so no resolution is given in the source.

References

Primary source

Sam Chow and Niclas Technau, “Littlewood and Duffin–Schaeffer-type problems in diophantine approximation”, arXiv:2010.09069 (2023).

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