The geometric-solution conjecture for the complex volume of hyperbolic knots

From papers

Let KK be a hyperbolic knot, and let xx be an algebraic solution of the periodicity equations associated with the braid-induced triangulation of S3KS^3\setminus K. For the jjth octahedron, let [Rεjkjε][\overset{k_j\phantom{\varepsilon}}{\mathsf{R}^{\varepsilon_j}}] denote its corresponding data, let x[j]\boldsymbol{x}[j] denote the associated variables, and let L([Rεjkjε];x[j])\operatorname{L}([\overset{k_j\phantom{\varepsilon}}{\mathsf{R}^{\varepsilon_j}}];\boldsymbol{x}[j]) be the dilogarithm function defined in the paper. The complex volume of KK is i(Vol(S3K)+iCS(S3K))\mathrm{i}(\operatorname{Vol}(S^3\setminus K)+\mathrm{i}\operatorname{CS}(S^3\setminus K)). Complex-volume conjecture. There exists an algebraic solution of the periodicity equations such that

i(Vol(S3K)+iCS(S3K))=j=1mL([Rεjkjε];x[j]).\mathrm{i}\left(\operatorname{Vol}(S^3\setminus K)+\mathrm{i}\operatorname{CS}(S^3\setminus K)\right)=\sum_{j=1}^m\operatorname{L}([\overset{k_j\phantom{\varepsilon}}{\mathsf{R}^{\varepsilon_j}}];\boldsymbol{x}[j]).

The expected solution is geometric: the additional two points have canceling neighbors and determine a complete hyperbolic structure on S3KS^3\setminus K. Numerical examples are discussed, but the authors state that they do not know how to extract such a preferred solution in general from the periodicity equations.

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Sources & referencesView supporting material

Primary source

Kazuhiro Hikami and Rei Inoue, “Braids, Complex Volume, and Cluster Algebra”, arXiv:1304.4776 (2014).

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