3 papers
math.GR2026
Depth of free-by-cyclic groups
Spencer Dowdall, Yassine Guerch, Radhika Gupta +2
For a free group automorphism, we prove that its poset of attracting lamination orbits is a canonical invariant of the associated mapping torus. That is, if a free-by-cyclic group…
math.GT2023
Counting mapping classes by Nielsen-Thurston type
Spencer Dowdall, Howard Masur
This paper concerns the lattice counting problem for the mapping class group of a surface acting on Teichmüller space with the Teichmüller metric. In that problem the goal is t…
math.GT2012
Pseudo-Anosov subgroups of fibered 3-manifold groups
Spencer Dowdall, Richard P. Kent, Christopher J. Leininger
Let X be a hyperbolic surface and H the fundamental group of a hyperbolic 3-manifold that fibers over the circle with fiber X. Using the Birman exact sequence, H embeds in the mapp…