Group Actions and Dynamics Seminar
During the Fall 2025 semester, RTG / Group Actions and Dynamics seminar meets in room B123 Van Vleck on Mondays from 2:25pm - 3:15pm. To sign up for the mailing list send an email from your wisc.edu address to dynamics+join@g-groups.wisc.edu. For more information, contact Paul Apisa, Tullia Dymarz, Autumn Kent, Marissa Loving, Caglar Uyanik, Chenxi Wu or Andy Zimmer.
Fall 2025
| date | speaker | title | host(s) |
|---|---|---|---|
| September 8 | Brandis Whitfield (UW) | Constructing reducibly geometrically finite subgroups of the mapping class group | local |
| September 15 | Jesús Hernández Hernández (UNAM) | TBA | Loving |
| September 22 | Junmo Ryang (Rice) | TBA | Loving and Uyanik |
| September 29 | Jagerynn Verano (UIC) | TBA | Loving |
| October 6 | Vicky Wen (UW) | TBA | local |
| October 13 | |||
| October 20 | Dongryul Kim (Yale) | TBA | Zimmer |
| October 27 | Niclas Technau (UW) | TBA | local |
| November 3 | Neil Hoffman (UMN-Duluth) | TBA | Uyanik |
| November 10 | Chenxi Wu (UW) | TBA | local |
| November 17 | Marissa Loving (UW) | TBA | local |
| November 24 | Andrew Zimmer (UW) | TBA | local |
| December 1 | Caglar Uyanik (UW) | TBA | local |
| December 8 | reserved | TBA |
Fall Abstracts
Brandis Whitfield
A longstanding goal within low-dimensional geometry and topology is to establish parallels between the theory of Kleinian groups and subgroups of the mapping class group. Convex-cocompact subgroups of the mapping class group have been well studied in the past few decades; current research aims to extend this analogy to the more general class of geometric finiteness. Dowdall–Durham–Leininger–Sisto introduce parabolically geometrically finite (PGF) subgroups of the mapping class group whose coned-off Cayley graphs, with respect to a collection of twist subgroups, quasi-isometrically embed into the curve complex. In joint work with Aougab, Bray, Dowdall, Hoganson and Maloni, we extend this definition to allow the coned-off subgroups to be more generally reducible, and produce plentiful examples of this behavior. Our examples include free products of reducible subgroups and the beloved right-angled Artin constructions of Clay–Mangahas–Leininger.
Jesús Hernández Hernández
Junmo Ryang
Jagerynn Verano
Vicky Wen
Dongryul Kim
Niclas Technau
Neil Hoffman
Chenxi Wu
Marissa Loving
Andrew Zimmer
Caglar Uyanik
Archive of past Dynamics seminars
2024-2025 Dynamics_Seminar_2024-2025
2023-2024 Dynamics_Seminar_2023-2024
2022-2023 Dynamics_Seminar_2022-2023
2021-2022 Dynamics_Seminar_2021-2022
2020-2021 Dynamics_Seminar_2020-2021