Conjecture on convergence of the Flint-Hills series at prescribed irrationality measure

Let u,v>0u,v>0 satisfy 1+uv>21+\frac{u}{v}>2. Let μ(α)\mu(\alpha) denote the irrationality measure of an irrational real number α\alpha, let P\mathcal{P} be a sine-like function with period α\alpha, and let Su,v\mathcal{S}_{u,v} and Au,v\mathcal{A}_{u,v} be the series defined in the paper.

Convergence conjecture. There is an irrational α\alpha with

μ(α)=1+uv,\mu(\alpha)=1+\frac{u}{v},

such that, for every sine-like function P\mathcal{P} with period α\alpha, the series Su,v\mathcal{S}_{u,v} converges, and consequently Au,v\mathcal{A}_{u,v} converges as well.

The preceding theorem constructs, for every u,v>0u,v>0, an irrational α\alpha of the same prescribed irrationality measure for which both series diverge. The author therefore conjectures that convergence can also occur when 1+uv>21+\frac{u}{v}>2; the source provides no resolution of this claim.

Sources & referencesView supporting material

Primary source

Alex Meiburg, “Bounds on Irrationality Measures and the Flint-Hills Series”, arXiv:2208.13356 (2022).

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