The Moduli Problem of Lobb and Zentner and the Coloured sl(N) Graph Invariant

Abstract

Motivated by a possible connection between the $\mathrm{SU}(N)$ instanton knot Floer homology of Kronheimer and Mrowka and $\mathfrak{sl}(N)$ Khovanov-Rozansky homology, Lobb and Zentner recently introduced a moduli problem associated to colourings of trivalent graphs of the kind considered by Murakami, Ohtsuki and Yamada in their state-sum interpretation of the quantum $\mathfrak{sl}(N)$ knot polynomial. For graphs with two colours, they showed this moduli space can be thought of as a representation variety, and that its Euler characteristic is equal to the $\mathfrak{sl}(N)$ polynomial of the graph evaluated at 1. We extend their results to graphs with arbitrary colourings by irreducible anti-symmetric representations of $\mathfrak{sl}(N)$.

13 pages, minor changes and corrections by suggestion of referee

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