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State graphs and fibered state surfaces

Darlan Girão and Jessica S Purcell

Algebraic & Geometric Topology 20 (2020) 987–1014
Abstract

Associated to every state surface for a knot or link is a state graph, which embeds as a spine of the state surface. A state graph can be decomposed along cut-vertices into graphs with induced planar embeddings. Associated with each such planar graph is a checkerboard surface, and each state surface is a fiber if and only if all of its associated checkerboard surfaces are fibers. We give an algebraic condition that characterizes which checkerboard surfaces are fibers directly from their state graphs. We use this to classify fibering of checkerboard surfaces for several families of planar graphs, including those associated with 2–bridge links. This characterizes fibering for many families of state surfaces.

Keywords
fibered links, Kauffman state, state graph, state surface, $2$–bridge link
Mathematical Subject Classification 2010
Primary: 57M25, 57M27
References
Publication
Received: 18 February 2019
Revised: 16 June 2019
Accepted: 8 July 2019
Published: 23 April 2020
Authors
Darlan Girão
Department of Mathematics
Universidade Federal do Ceará
Fortaleza-CE
Brazil
Jessica S Purcell
School of Mathematical Sciences
Monash University
Clayton, VIC
Australia