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Copenhagen
We meet on Wednesdays from 15:15 to 16:15. If you have any questions about the seminar or want to be added to the email list, please contact one of the organizers:
08/10/2025, Aud 6
Adriana Fernández I Quero (KU Leuven)
Title: W*-superrigidity for property (T) groups with infinite center
Title: W*-superrigidity for property (T) groups with infinite center
Abstract: In this talk we consider a natural version of Connes' Rigidity Conjecture that involves property (T) groups with infinite center. Utilizing techniques at the intersection of von Neumann algebras and geometric group theory, we establish several cases where this conjecture holds. In particular, we provide the first example of a W*-superrigid property (T) group with infinite center. This is joint work with Ionut Chifan, Denis Osin and Hui Tan.
15/10/2025
No Seminar (Autumn Break)
22/10/2025, HCØ 4.20
Matteo Pagliero (University of Southern Denmark)
Note: This seminar will take place at 14:00-15:00.
Title: Corona algebras and strongly self-absorbing C*-dynamics
Abstract: Recent work of Farah and of Farah–Szabó established a powerful link between absorption properties of non-unital C*-algebras and their corona algebras (i.e., quotients of the multiplier algebra by the algebra itself). They showed that if a non-unital C*-algebra tensorially absorbs a strongly self-absorbing C*-algebra, then every relative commutant (by a separable subalgebra) in its corona must contain a unital copy of that strongly self-absorbing algebra. In this talk, I will present a dynamical analogue of this result, establishing a new connection between absorption phenomena and the structure of corona actions. As an intermediate step toward the main theorem, I will show that corona actions enjoy what we call the dynamical folding property. This is a strong structural feature that generalises an earlier insight of Phillips and Weaver. All results discussed are based on joint work with Xiuyuan Li and Gábor Szabó, available on arXiv.
29/10/2025, HCØ 4.01
Evgenios Kakariadis (Newcastle University)
Note: This seminar will take place at 14:00-15:00.
Title: TBA
Abstract: TBA
05/11/2025, Aud 7
Nicolas Gilliers (Université de Paris Cité)
Title: TBA
Abstract: TBA
12/11/2025, Aud 7
Matthew Kennedy (University of Waterloo)
Title: TBA
Abstract: TBA
19/11/2025, Aud 7
Brent Nelson (Michigan State University)
Title: TBA
Abstract: TBA
27/11/2025, TBA
Corina Ciobotaru (Aarhus University)
Note: This seminar will take place at 16:15-17:15.
Title: TBA
Abstract: TBA
03/12/2025, TBA
Arnaud Brothier (University of Trieste)
Title: TBA
Abstract: TBA
10/12/2025, TBA
Andrew Toms (Purdue University)
Title: TBA
Abstract: TBA
08/04/2025, TBA
Tianyi Zheng (UC San Diego) *to be confirmed*
Title: TBA
Abstract: TBA
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