The torus-knot invariant formula conjecture

Let T(p,q)T(p,q) be a torus knot of type (p,q)(p,q), where pp and qq are coprime integers. Let ρj,k ⁣:πT(p,q)SO(3)\rho_{j,k}\colon \pi T(p,q)\to\operatorname{SO}(3) send the standard generators aa and bb to rotations through angles 2πj/p2\pi j/p and 2πk/q2\pi k/q about distinct axes, respectively, with 1jp/21\leq j\leq\lfloor p/2\rfloor and 1kq/21\leq k\leq\lfloor q/2\rfloor. Denote the corresponding invariant by Ij,k(T(p,q))I_{j,k}(T(p,q)). The torus-knot invariant formula conjecture.

Ij,k(T(p,q))=1(pq)2(4sinjπpsinkπq)4.I_{j,k}(T(p,q))=\frac{1}{(pq)^2}\left(4\sin\frac{j\pi}{p}\sin\frac{k\pi}{q}\right)^4.

This is the paper's proposed formula for the Euclidean invariant associated with the specified nonabelian representation of a torus knot. It is presented as an observed expression rather than proved generally, so its validity beyond the calculations discussed remains open.

Sources & referencesView supporting material

Primary source

Evgeniy V. Martyushev, “Euclidean Geometric Invariants of Links in 3-sphere”, arXiv:math/0409241 (2007).

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