The torus-knot invariant formula conjecture

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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 1≤j≤⌊p/2⌋1\leq j\leq\lfloor p/2\rfloor and 1≤k≤⌊q/2⌋1\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(4sin⁡jπpsin⁡kπq)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.

References

Primary source

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

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