21w5011 Home Confirmed Participants Schedule Workshop Videos

Testimonials

Cohomology of Arithmetic Groups: Duality, Stability, and Computations

Videos from BIRS Workshop

Avner Ash, Boston College

Monday Oct 11, 2021 08:02 - 08:51

Homology of arithmetic groups and Galois representations

Watch video | Download video: 202110110802-Ash.mp4 (67M)

Video: Avner Ash, "Homology of arithmetic groups and Galois representations" http://www.birs.ca/events/2021/5-day-workshops/21w5011/videos/watch/202110110802-Ash.html

Peter Patzt, University of Oklahoma

Monday Oct 11, 2021 09:02 - 09:54

Rognes' connectivity conjecture and the Koszul dual of Steinberg

Watch video | Download video: 202110110902-Patzt.mp4 (259M)

Video: Peter Patzt, "Rognes' connectivity conjecture and the Koszul dual of Steinberg" http://www.birs.ca/events/2021/5-day-workshops/21w5011/videos/watch/202110110902-Patzt.html

Alexander Kupers, University of Toronto

Monday Oct 11, 2021 10:31 - 11:26

On homological stability for

$\mathrm{GL}_n(\mathbb{Z})$

Watch video | Download video: 202110111031-Kupers.mp4 (255M)

Video: Alexander Kupers, "On homological stability for

$\mathrm{GL}_n(\mathbb{Z})$ " http://www.birs.ca/events/2021/5-day-workshops/21w5011/videos/watch/202110111031-Kupers.html

Mathilde Gerbelli-Gauthier, McGill University

Monday Oct 11, 2021 15:01 - 15:25

Growth of cohomology in towers and endoscopy

Watch video | Download video: 202110111501-Gerbelli-Gauthier.mp4 (38M)

Video: Mathilde Gerbelli-Gauthier, "Growth of cohomology in towers and endoscopy" http://www.birs.ca/events/2021/5-day-workshops/21w5011/videos/watch/202110111501-Gerbelli-Gauthier.html

Nathalie Wahl, University of Copenhagen

Tuesday Oct 12, 2021 08:04 - 08:49

Stability in the homology of classical groups

Watch video | Download video: 202110120804-Wahl.mp4 (291M)

Video: Nathalie Wahl, "Stability in the homology of classical groups" http://www.birs.ca/events/2021/5-day-workshops/21w5011/videos/watch/202110120804-Wahl.html

Nathan Broaddus, The Ohio State University

Tuesday Oct 12, 2021 10:31 - 11:24

Level structures and images of the Steinberg module for surfaces with marked points

Watch video | Download video: 202110121031-Broaddus.mp4 (72M)

Video: Nathan Broaddus, "Level structures and images of the Steinberg module for surfaces with marked points" http://www.birs.ca/events/2021/5-day-workshops/21w5011/videos/watch/202110121031-Broaddus.html

Frank Calegari, University of Chicago

Tuesday Oct 12, 2021 13:02 - 13:56

The stable cohomology of

$\mathrm{SL}(\mathbb{F}_p)$

Watch video | Download video: 202110121302-Calegari.mp4 (127M)

Video: Frank Calegari, "The stable cohomology of

$\mathrm{SL}(\mathbb{F}_p)$ " http://www.birs.ca/events/2021/5-day-workshops/21w5011/videos/watch/202110121302-Calegari.html

Dan Yasaki, The University of North Carolina at Greensboro

Tuesday Oct 12, 2021 14:38 - 15:21

Cohomology of Congruence Subgroups, Steinberg Modules, and Real Quadratic Fields

Watch video | Download video: 202110121438-Yasaki.mp4 (151M)

Video: Dan Yasaki, "Cohomology of Congruence Subgroups, Steinberg Modules, and Real Quadratic Fields" http://www.birs.ca/events/2021/5-day-workshops/21w5011/videos/watch/202110121438-Yasaki.html

Melody Chan, Brown University

Wednesday Oct 13, 2021 08:02 - 08:56

The top-weight rational cohomology of

$\mathcal{A}_g$

Watch video | Download video: 202110130802-Chan.mp4 (92M)

Video: Melody Chan, "The top-weight rational cohomology of

$\mathcal{A}_g$ " http://www.birs.ca/events/2021/5-day-workshops/21w5011/videos/watch/202110130802-Chan.html

Paul Gunnells, University of Massachusetts

Wednesday Oct 13, 2021 09:03 - 09:58

Modular symbols over function fields

Watch video | Download video: 202110130903-Gunnells.mp4 (280M)

Video: Paul Gunnells, "Modular symbols over function fields" http://www.birs.ca/events/2021/5-day-workshops/21w5011/videos/watch/202110130903-Gunnells.html

Mark McConnell, Princeton University

Wednesday Oct 13, 2021 10:33 - 11:23

Binary Quadratic Forms and Hecke Operators for

$\mathrm{SL}(2,\mathbb{Z})$

Watch video | Download video: 202110131033-McConnell.mp4 (71M)

Video: Mark McConnell, "Binary Quadratic Forms and Hecke Operators for

$\mathrm{SL}(2,\mathbb{Z})$ " http://www.birs.ca/events/2021/5-day-workshops/21w5011/videos/watch/202110131033-McConnell.html

Benson Farb, University of Chicago

Thursday Oct 14, 2021 10:32 - 11:24

Rigidity of moduli spaces

Watch video | Download video: 202110141032-Farb.mp4 (129M)

Video: Benson Farb, "Rigidity of moduli spaces" http://www.birs.ca/events/2021/5-day-workshops/21w5011/videos/watch/202110141032-Farb.html

Matthew Emerton, University of Chicago

Thursday Oct 14, 2021 13:03 - 13:58

Cohomology of Shimura varieties via categorical Langlands

Watch video | Download video: 202110141303-Emerton.mp4 (81M)

Video: Matthew Emerton, "Cohomology of Shimura varieties via categorical Langlands" http://www.birs.ca/events/2021/5-day-workshops/21w5011/videos/watch/202110141303-Emerton.html

Tony Feng, UC Berkeley

Thursday Oct 14, 2021 14:10 - 14:41

The Galois action on symplectic

$K$ -theory

Watch video | Download video: 202110141410-Feng.mp4 (51M)

Video: Tony Feng, "The Galois action on symplectic

$K$ -theory" http://www.birs.ca/events/2021/5-day-workshops/21w5011/videos/watch/202110141410-Feng.html

Benjamin Brück, ETH Zürich

Thursday Oct 14, 2021 15:01 - 15:31

High-dimensional rational cohomology of

$\operatorname{SL}_n(\mathbb{Z})$ and

$\operatorname{Sp}_{2n}(\mathbb{Z})$

Watch video | Download video: 202110141501-Bruck.mp4 (171M)

Video: Benjamin Brück, "High-dimensional rational cohomology of

$\operatorname{SL}_n(\mathbb{Z})$ and

$\operatorname{Sp}_{2n}(\mathbb{Z})$ " http://www.birs.ca/events/2021/5-day-workshops/21w5011/videos/watch/202110141501-Bruck.html

Orsola Tommasi, Università di Padova

Friday Oct 15, 2021 08:07 - 09:02

Stability results for toroidal compactifications of

$\mathcal{A}_g$

Watch video | Download video: 202110150807-Tommasi.mp4 (167M)

Video: Orsola Tommasi, "Stability results for toroidal compactifications of

$\mathcal{A}_g$ " http://www.birs.ca/events/2021/5-day-workshops/21w5011/videos/watch/202110150807-Tommasi.html

Fabian Hebestreit, University of Aberdeen

Friday Oct 15, 2021 09:05 - 09:30

The stable cohomology of symplectic groups over the integers

Watch video | Download video: 202110150905-Hebestreit.mp4 (37M)

Video: Fabian Hebestreit, "The stable cohomology of symplectic groups over the integers" http://www.birs.ca/events/2021/5-day-workshops/21w5011/videos/watch/202110150905-Hebestreit.html

Jordan Ellenberg, University of Wisconsin

Friday Oct 15, 2021 09:37 - 09:50

Legendre symbols and secondary stability

Watch video | Download video: 202110150937-Ellenberg.mp4 (34M)

Video: Jordan Ellenberg, "Legendre symbols and secondary stability" http://www.birs.ca/events/2021/5-day-workshops/21w5011/videos/watch/202110150937-Ellenberg.html