View source for Group Actions and Dynamics Seminar

During the Fall 2024 semester, '''RTG / Group Actions and Dynamics''' seminar meets in room '''B325 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, Marissa Loving, Caglar Uyanik, Chenxi Wu or Andy Zimmer.  


== Fall 2024 ==

{| cellpadding="8"
!align="left" | date
!align="left" | speaker
!align="left" | title
!align="left" | host(s)

|-
|September 9
|[https://sites.google.com/view/maxlahn/ Max Lahn] (Michigan)
|TBA
|Uyanik and Zimmer
|-
|September 16
|[https://loweb24.github.io Ben Lowe] (Chicago)
|TBA
|Al Assal
|-
|September 23
|[http://www.harrisonbray.com/ Harrison Bray] (George Mason)
|A 0-1 law for horoball packings of coarsely hyperbolic metric spaces and applications to cusp excursion
|Zimmer
|-
|September 30
|[http://eliotbongiovanni.com/ Eliot Bongiovanni] (Rice)
|TBA
|Uyanik
|-
|October 7
|[https://dornsife.usc.edu/francis-bonahon/ Francis Bonahon] (USC/Michigan State)
|TBA
|Loving
|-
|October 21
|[https://gauss.math.yale.edu/~dk929/ Dongryul Kim] (Yale)
|TBA
|Uyanik
|-
|October 28
|[https://sites.google.com/view/mgdurham/ Matthew Durham] (UC Riverside) 
|TBA
|Loving
|-
|November 4
|[https://www.caglaruyanik.com/ Caglar Uyanik] (UW)
|Cannon-Thurston maps, random walks, and rigidity
|local
|-
|November 18
|[https://sites.google.com/view/paigehillen/home Paige Hillen] (UCSB)
|TBA
|Dymarz
|-
|}

== Fall Abstracts ==

===Max Lahn===

===Ben Lowe===

===Harrison Bray===
On the cusp of the 100 year anniversary, Khinchin's theorem implies a strong 0-1 law for the real line; namely, the set of real numbers within distance q^{-2-\epsilon} of infinitely many rationals p/q is Lebesgue measure 0 for \epsilon>0, and full measure for \epsilon=0. In these lectures, I will present an analogous result for horoball packings in Gromov hyperbolic metric spaces. As an application, we prove a logarithm law; that is, we prove asymptotics for the depth in the packing of a typical geodesic.  This is joint work with Giulio Tiozzo.

===Eliot Bongiovanni===

===Francis Bonahon===

===Dongryul Kim===

===Matthew Durham===

===Caglar Uyanik===
Cannon and Thurston showed that a hyperbolic 3-manifold that fibers over the circle gives rise to a sphere-filling curve. The universal cover of the fiber surface is quasi-isometric to the hyperbolic plane, whose boundary is a circle, and the universal cover of the 3-manifold is 3-dimensional hyperbolic space, whose boundary is the 2-sphere. Cannon and Thurston showed that the inclusion map between the universal covers extends to a continuous map between their boundaries, whose image is dense. In particular, any measure on the circle pushes forward to a measure on the 2-sphere using this map. We compare several natural measures coming from this construction.

===Paige Hillen===

== Spring 2025 ==

{| cellpadding="8"
!align="left" | date
!align="left" | speaker
!align="left" | title
!align="left" | host(s)

|-
|January 27
|Ben Stucky (Beloit)
|TBA
|semi-local
|-
|April 21
|[https://www.math.utah.edu/~bestvina/ Mladen Bestvina] (Utah)
|[https://wiki.math.wisc.edu/index.php/Colloquia/Spring_2025 Distinguished Lecture Series]
|Uyanik
|-
|April 28
|[https://people.math.umass.edu/~baykur/ Inanc Baykur] (UMass)
|TBA
|Uyanik
|}



== Archive of past Dynamics seminars==

2023-2024 [[Dynamics_Seminar_2023-2024]]

2022-2023 [[Dynamics_Seminar_2022-2023]]

2021-2022 [[Dynamics_Seminar_2021-2022]]

2020-2021 [[Dynamics_Seminar_2020-2021]]