Group Actions and Dynamics Seminar

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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