Events for 10/16/2019 from all calendars

Quantum Symmetries Seminar

Time: 11:00AM - 12:00PM

Location: BLOC 111

Speaker: Qing Zhang, Texas A&M University

Title: Exercise 12

Student Working Seminar in Groups and Dynamics

Time: 1:00PM - 2:00PM

Location: BLOC 628

Speaker: Amanda Hoisington

Title: Coarse embeddings under group extensions I

Abstract: I will be going over a paper by Arzhantseva and Tessera (2017) which proves, by construction, that admitting a coarse embedding into Hilbert space is not preserved under group extension.

Noncommutative Geometry Seminar

Time: 2:00PM - 2:50PM

Location: BLOC 628

Speaker: Jianchao Wu, Texas A&M University

Title: The K-theory of C*-algebras associated to certain infinite dimensional spaces

Abstract: Noncommutative geometry provides a potent approach to the study of the algebraic geometry (e.g., K-theory) of infinite dimensional manifolds. In this talk, I will outline the construction of C*-algebras associated to Hilbert-Hadamard spaces, understood as a kind of (typically infinite dimensional) nonpositively curved manifolds. Under mild assumptions, these C*-algebras retain a remnant of Bott periodicity, which we exploit to prove the Novikov conjecture of geometrically discrete groups of diffeomorphisms. This is joint work with Sherry Gong and Guoliang Yu.

Groups and Dynamics Seminar

Time: 3:00PM - 4:00PM

Location: BLOC 220

Speaker: Vadim Kaimanovich, University of Ottawa

Title: Freedom and boundaries

Abstract: I will outline recent results (joint with Anna Erschler) on the stabilizers of the group action on its Poisson boundary: existence of a free boundary action for any group with infinite conjugacy classes, a complete description of the possible kernels of such actions, and an example of a totally non-free boundary action.

Graduate Student Organization Seminar

Time: 4:00PM - 5:00PM

Location: BLOC 628

Speaker: Tolulope Oke

Title: Cup Products on Hochschild Cohomology

Abstract: The Hochschild cohomology of an associative algebra $\Lambda$ possesses a cup product making it a graded commutative ring. I will give equivalent definitions of the cup product on Hochschild cohomology. There is a cup product formula on the Hochschild cohomology of a family of quiver algebras. I will present this formula and if time permits, I will discuss its application in connection to a finite generation conjecture.