Events for 04/25/2018 from all calendars

Noncommutative Geometry Seminar

Time: 2:00PM - 2:50PM

Location: BLOC 628

Speaker: Yanli Song, Washington University at St. Louis

Title: Orbital integral and K-theory

Abstract: In this talk, I will discuss the K-theory of group C*-algebra and Connes-Kasparov isomorphism for reductive Lie group. The main method we used is the orbital integral introduced by Harish-Chandra. I will try to explain some connections between the representation theory of Lie group and index of Dirac operators. This is a joint work with Higson and Tang.

Numerical Analysis Seminar

Time: 3:00PM - 4:00PM

Location: BLOC 628

Speaker: Jesse Chan, Rice University

Title: Discretely entropy stable high order methods for nonlinear conservation laws

Abstract: High order methods offer several advantages in the approximation of solutions of nonlinear conservation laws, such as improved accuracy and low numerical dispersion/dissipation. However, these methods also tend to suffer from instability in practice, requiring filtering, limiting, or artificial dissipation to prevent solution blow up. Provably stable finite difference methods based on summation-by-parts (SBP) operators and a concept known as flux differencing address this inherent instability by ensuring that the solution satisfies a semi-discrete entropy inequality. In this talk, we discuss how to construct discretely entropy stable high order discontinuous Galerkin methods by generalizing entropy stable finite difference schemes using discrete L2 projection matrices and “decoupled” SBP operators. Extensions to curvilinear meshes will be also discussed, and numerical experiments for the one and two-dimensional compressible Euler equations confirm the semi-discrete stability and high order accuracy of the resulting methods.

Groups and Dynamics Seminar

Time: 3:00PM - 4:00PM

Location: BLOC 220

Speaker: Guoliang Yu, Texas A&M

Title: A friendly introduction to the Baum-Connes conjecture (part 2)

Abstract: In this talk, I will give an introduction to the Baum-Connes conjecture and discuss its applications. I will explain how geometry of groups comes into the picture.

First Year Graduate Student Seminar

Time: 5:30PM - 6:30PM

Location: BLOC 628

Speaker: Peter Howard

Title: Summer 2018 and the years ahead