Graphs on surfaces and Khovanov homology

Details Graphs on surfaces and Khovanov homology Graphs on surfaces and Khovanov homology

2007-05-23

arxiv.org/abs/0705.3453v1

Algebraic and Geometric Topology 7 (2007), 1531-1540.

Mathematics

Geometric Topology

8 pages, 5 figures

Scientific paper

Oriented ribbon graphs (dessins d'enfant) are graphs embedded in oriented surfaces. A quasi-tree of a ribbon graph is a spanning subgraph with one face, which is described by an ordered chord diagram. We show that for any link diagram $L$, there is an associated ribbon graph whose quasi-trees correspond bijectively to spanning trees of the graph obtained by checkerboard coloring $L$. This correspondence preserves the bigrading used for the spanning tree model of Khovanov homology, whose Euler characteristic is the Jones polynomial of $L$. Thus, Khovanov homology can be expressed in terms of ribbon graphs, with generators given by ordered chord diagrams.

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