Title page for ETD etd-07082010-142254

Type of Document Dissertation
Author Cohen, Moshe
URN etd-07082010-142254
Title Dimer Models for Knot Polynomials
Degree Doctor of Philosophy (Ph.D.)
Department Mathematics
Advisory Committee
Advisor Name Title
Dasbach, Oliver Committee Chair
Litherland, Richard Committee Member
Morales, Jorge Committee Member
Neubrander, Frank Committee Member
Oporowski, Bogdan Committee Member
Tohline, Joel Dean's Representative
  • spanning trees
  • knot theory
Date of Defense 2010-06-24
Availability unrestricted
A dimer model consists of all perfect matchings on a (bipartite) weighted signed graph, where the product of the signed weights of each perfect matching is summed to obtain an invariant. In this paper, the construction of such a graph from a knot diagram is given to obtain the Alexander polynomial. This is further extended to a more complicated graph to obtain the twisted Alexander polynomial, which involved "twisting" by a representation. The space of all representations of a given knot complement into the general linear group of a fixed size can be described by the same graph.

This work also produces a bipartite weighted signed graph to obtain the Jones polynomial for the infinite class of pretzel knots as well as for some other constructions. This is a corollary to a stronger result that calculates the activity words for the spanning trees of the Tait graph associated to a pretzel knot diagram, and this has several other applications, as well, including the Tutte polynomial and the spanning tree model of reduced Khovanov homology.

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