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arXiv · 2611.00251

Upper bounds for packings of cylinders around the unit sphere

Alexey Glazyrin
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Abstract

In this note we study the problem of packing infinite circular cylinders tangent to the unit sphere. For a given number of cylinders $N$, $N\geq 3$, the maximal common cylinder radius $R_N$ is the maximum $R$ for which there exist $N$ circular cylinders of radius $R$ with non-overlapping interiors, all tangent to the unit sphere. In 1990, Kuperberg conjectured that there does not exist a packing of more than 6 cylinders of radius one tangent to the unit sphere, that is, $R_7<1$. This conjecture was recently confirmed by an exhaustive computer-assisted case analysis. Here we prove new bounds for $R_N$ for small $N$ by considering an auxiliary configuration of spherical quadrilaterals. In particular, we provide a short geometric proof of Kuperberg's conjecture and show that $R_7<0.9978$.

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Alexey Glazyrin. 2026-10-30. Upper bounds for packings of cylinders around the unit sphere. https://arxiv.org/abs/2611.00251

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