Algebraic & Geometric Topology

Heegaard Floer homology of spatial graphs

Shelly Harvey and Danielle O’Donnol

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Abstract

We extend the theory of combinatorial link Floer homology to a class of oriented spatial graphs called transverse spatial graphs. To do this, we define the notion of a grid diagram representing a transverse spatial graph, which we call a graph grid diagram. We prove that two graph grid diagrams representing the same transverse spatial graph are related by a sequence of graph grid moves, generalizing the work of Cromwell for links. For a graph grid diagram representing a transverse spatial graph f : G S3, we define a relatively bigraded chain complex (which is a module over a multivariable polynomial ring) and show that its homology is preserved under the graph grid moves; hence it is an invariant of the transverse spatial graph. In fact, we define both a minus and hat version. Taking the graded Euler characteristic of the homology of the hat version gives an Alexander type polynomial for the transverse spatial graph. Specifically, for each transverse spatial graph f, we define a balanced sutured manifold (S3 f(G),γ(f)). We show that the graded Euler characteristic is the same as the torsion of (S3 f(G),γ(f)) defined by S Friedl, A Juhász, and J Rasmussen.

Article information

Source
Algebr. Geom. Topol., Volume 17, Number 3 (2017), 1445-1525.

Dates
Received: 23 September 2015
Revised: 11 October 2016
Accepted: 28 October 2016
First available in Project Euclid: 16 November 2017

Permanent link to this document
https://projecteuclid.org/euclid.agt/1510841403

Digital Object Identifier
doi:10.2140/agt.2017.17.1445

Mathematical Reviews number (MathSciNet)
MR3677933

Zentralblatt MATH identifier
1372.57008

Subjects
Primary: 57M15: Relations with graph theory [See also 05Cxx]
Secondary: 05C10: Planar graphs; geometric and topological aspects of graph theory [See also 57M15, 57M25]

Keywords
spatial graphs Heegaard Floer homology grid diagrams embedded graph

Citation

Harvey, Shelly; O’Donnol, Danielle. Heegaard Floer homology of spatial graphs. Algebr. Geom. Topol. 17 (2017), no. 3, 1445--1525. doi:10.2140/agt.2017.17.1445. https://projecteuclid.org/euclid.agt/1510841403


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