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Unsigned State Models for the Jones Polynomial
Iain Moffatt
Department of Combinatorics and Optimization, University of Waterloo, 200 University Avenue West Waterloo, Ontario, Canada
imoffatt@jaguar1.usouthal.edu
Annals of Combinatorics 15 (1) pp.127-146 January, 2011
AMS Subject Classification: 05C10, 57M27
Abstract:
It is a well-known and fundamental result that the Jones polynomial can be expressed as Potts and vertex partition functions of signed plane graphs. Here we consider constructions of the Jones polynomial as state models of unsigned graphs and show that the Jones polynomial of any link can be expressed as a vertex model of an unsigned embedded graph. In the process of deriving this result, we show that for every diagram of a link in S3 there exists a diagram of an alternating link in a thickened surface (and an alternating virtual link) with the same Kauffman bracket. We also recover two recent results in the literature relating to the Jones and Bollob´as-Riordan polynomials and show they arise from two different interpretations of the same embedded graph.
Keywords: Bollobás-Riordan polynomial, embedded graphs, Jones polynomial, medial graph, Potts model, ribbon graphs, vertex model

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