Geodesic
KNTZ trick from arborescent calculus and the structure of differential expansion
Teoretičeskaâ i matematičeskaâ fizika, Tome 204 (2020) no. 2, pp. 181-210 Cet article a éte moissonné depuis la source Math-Net.Ru

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The recently proposed Kameyama–Nawata–Tao–Zhang (KNTZ) trick completed the long search for exclusive Racah matrices $\overline S$ and $S$ for all rectangular representations. The success of this description is a remarkable achievement of modern knot theory and classical representation theory, which was initially considered a tool for knot calculus but instead turned out to be its direct beneficiary. We show that this approach in fact consists in converting the arborescent evolution matrix $\overline S\,\overline T^2\,\overline S$ into the triangular form $\mathcal B$, and we demonstrate how this works and show how the previous puzzles and miracles of the differential expansions look from this standpoint. Our conjecture for the form of the triangular matrix $\mathcal B$ in the case of the nonrectangular representation $[3,1]$ is completely new. No calculations are simplified in this case, but we explain how it all works and what remains to be done to completely prove the conjecture. The discussion can also be useful for extending the method to nonrectangular cases and for the related search for gauge-invariant arborescent vertices. As one more application, we present a puzzling, but experimentally supported, conjecture that the form of the differential expansion for all knots is completely described by a particular case of twist knots.
Keywords: knot polynomial, differential expansion
Mots-clés : Racah matrix. 
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A. Yu. Morozov. KNTZ trick from arborescent calculus and the structure of differential expansion. Teoretičeskaâ i matematičeskaâ fizika, Tome 204 (2020) no. 2, pp. 181-210. http://geodesic.mathdoc.fr/item/TMF_2020_204_2_a2/

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