Duality for the $\mathfrak{sl}_2$ weight system

TL;DR

This paper explores the duality properties of the $rak{sl}_2$ weight system on chord diagrams, extending previous computations by proving a conjecture related to intersection graph joins and introducing new graph-theoretic tools.

Contribution

It proves a conjecture about duality in the $rak{sl}_2$ weight system on certain chord diagrams and introduces the two-colored intersection graph and chord-adding operators.

Findings

Proved a duality conjecture for $rak{sl}_2$ weight system values.

Introduced the two-colored intersection graph of shares.

Developed chord-adding operators for analysis.

Abstract

The $\mathfrak{sl}_2$ weight system, corresponding to the colored Jones polynomial of knots, is one of the the simplest weight system for chord diagrams. Recent works have led to explicit computations of this weight system on chord diagrams with complete and complete bipartite intersection graphs using $\mathfrak{sl}_2$ weight systems on shares, i.e., on chord diagrams on two strands. In this paper, we continue our study of shares. We prove a conjecture by Lando about a duality of values of the $\mathfrak{sl}_2$ weight system on chord diagrams whose intersection graphs are joins of complementary graphs with discrete ones. To achieve this, we introduce the two-colored intersection graph of shares, define the inner product of shares, and use chord-adding operators.