Year: 2024
Type: article
Abstract: Genevois recently classified which graph braid groups are word hyperbolic. In the 3-strand case, he asked whether all such word hyperbolic groups are actually free; this reduced to checking two infinite classes of graphs: sun and pulsar graphs. We prove that 3-strand braid groups of sun graphs are free. On the other hand, it was known to experts that 3-strand braid groups of most pulsar graphs contain surface subgroups. We provide a simple proof of this and prove an additional structure theorem for these groups.
Authors: Benjamin Appiah, Pallavi Dani, Wayne Ge, Christopher Hudson, Saumya Jain, Matthew Lemoine, Jake Murphy, Justin Murray, Adithyan Pandikkadan, Kevin Schreve, Huong Vo
Institution: Louisiana State University
Language: English
Subfield: Geometry and Topology
Field: Mathematics
Domain: Physical Sciences
Open Access status: green
Funder: National Science Foundation
OpenAlex ID: W4403503836