Graphing conjecture for low-degree homotopy groups of long links

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Let nn, pp, and mm be integers with m≥2m\geq 2 and 1≤p≤n−31\leq p\leq n-3. Let Lm⋅pn\mathcal{L}_{m\cdot p}^{n} denote the space of long links with mm components of dimension pp in Rn\mathbb{R}^{n}, let Kpn\mathcal{K}_{p}^{n} denote the corresponding space of long knots, and let b21b_{21} and b31b_{31} be the indicated braid classes. For each pair or triple of components, use graphing and joining as in the statement, and let Sn−p−1S^{n-p-1} be the (n−p−1)(n-p-1)-sphere. Graphing conjecture. A minimal generating set for

π2n−3p−3Lm⋅pn\pi_{2n-3p-3}\mathcal{L}_{m\cdot p}^{n}

is given by the mm inclusions of a generator of π2n−3p−3Kpn\pi_{2n-3p-3}\mathcal{K}_{p}^{n}; the result of graphing and then joining two components of [b21,b31][b_{21},b_{31}] for every pair of components (i,j)(i,j) with 1≤i<j≤m1\leq i<j\leq m; the image under graphing of a minimal generating set of π2n−2p−3Sn−p−1\pi_{2n-2p-3}S^{n-p-1} for every pair (i,j)(i,j) with 1≤i<j≤m1\leq i<j\leq m; and, if m≥3m\geq 3, the result of graphing [b21,b31][b_{21},b_{31}] for every triple (i,j,k)(i,j,k) with 1≤i<j<k≤m1\leq i<j<k\leq m. This conjecture proposes an explicit description of generators in terms of knot inclusions, graphing, joining, and sphere homotopy classes; the torsion subgroup is the remaining issue in determining these groups.

References

Primary source

Robin Koytcheff, “Graphing, homotopy groups of spheres, and spaces of long links and knots”, arXiv:2205.00635 (2024).

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