Gjesteforelesninger og seminarer - Side 39

Magnus Landstad (NTNU) will give a talk with title: Exotic group C*-algebras and noncommutative duality.

Abstract: It  has long been known that for a (non-amenable) locally compact group G there are many C*-algebras between the full and reduced group C*-algebra. First I will discuss to what extent these intermediate algebras can be called group C*-algebras. Then I will look at algebras between the full and reduced crossed product, and the various types of coactions (full, maximal, normal) a group can have. To make arguments a little simpler, we shall assume G to be discrete.

Abstract: In groundbreaking work Thomason establishes a fundamental comparison between Bott-inverted algebraic K-theory and étale K-theory with finite coefficients. Over the complex numbers, Walker has shown how to deduce Thomason's theorem using a semi-topological K-homology theory. In joint work with J. Hornbostel we establish an equivariant generalization of Walker's Fundamental Comparison Theorem and use it to deduce the equivariant version of Thomason's theorem for complex varieties with action by a finite group. 

Salvador Ortiz-Latorre, EMMOS/CMA, holder et seminar med tittelen: A second order approximation of the continuous time filtering problem

Yoshiko Ogata, University of Tokyo, will give a talk with title: Approximating macroscopic observables in quantum spin systems with commuting matrices

Abstract: Macroscopic observables in a quantum spin system are spatial means of local observables in a UHF algebra. One of their properties is that they commute asymptotically as the system size goes to infinity. It is not true that any given set of asymptotically commuting matrices can be approximated by commuting ones in the norm topology. The main statement of this talk is that this is true for macroscopic observables.  

Bin Yu (Departments of Statistics and Electrical Engineering & Computer Science, UC Berkeley) will talk about

Spectral clustering and high-dim stochastic block model for undirected and directed graphs  

Jyotishman Bhowmick, UiO, will give a talk with title: Deformation of operator algebras by Borel cocycles

Abstract:Given a coaction of a locally compact group on a C^* algebra and fixing a cocycle on G, we discuss a method to deform A into another C^* algebra, thus generalizing  the works of Kasprzak, Yamashita and Rieffel. This is a joint work with S. Neshveyev and A.S. Sangha.

Krzystzof Paczka, CMA, holder et seminar med tittelen: G-Lévy processes: Ito calculus, jumps diffusions and robust optimal control

Fabio Divino (University of Molise, Italy) will talk about

MCMC computation for Bayesian modeling of presence-only data

Stuart White (University of Glasgow, UK) will talk on "Z-stability and central sequences".

Abstract: Over recent years, tensorial absorption of the Jiang-Su algebra $\mathcal Z$ has become a particularly prominent property of $C^*$-algebras. In this talk, I'll explain what this means, and why this is the case; I'll also discuss methods for establishing ``$\mathcal Z$''-stability using central sequence, and some more general properties of central sequence algebras. The talk will end with a recent result showing that for a simple separable unital nuclear C*-algebra, whose extremal traces are compact and of finite covering dimension $\mathcal Z$-stability can be detected by a comparison property of the Cuntz semigroup (this result is joint work with Andrew Toms and Wilhelm Winter, which has also been independently discovered by Eberhard Kirchberg and Mickael Rørdam, and by Yasuhiko Sato).  

Thierry Coupez is professor at Mines - Paristech

Nigel Cutland (Uni. York) holder et seminar med tittelen: An infinitesimal introduction to DEs driven by rough paths

Steffen Sjursen, CMA, holder et seminar med tittelen: On chaos representation and orthogonal polynomials for the doubly stochastic Poisson process

Kukatharmini Tharmaratnam (Department of Mathematics, University of Oslo) will talk about

Monotone splines lasso

Dana Williams, Dartmouth College (USA) will talk on "Equivalence theorems and linking groupoids".

We will take a look at ideas for Mechanics Academy (MA), a freely-accessible web-based resource for anyone aiming to learn mechanics.

Harish Narayanan is at SIMULA.

Torstein Nilssen, CMA, holder et seminar med tittelen: Noise Prevents Singularities in Linear Transport Equations

Thordis Thorarinsdottir (Norwegian Computing Center) will talk about

Proper scoring rules and divergences to evaluate weather and climate models

Alex Lenkoski (Norwegian Computing Center and Statistics for Innovation) will talk about

Hierarchical Gaussian Graphical Models: Reversible Jump and Beyond

Rüdiger Kiesel,Uni. Essen/CMA, holder et seminar med tittelen: Model Risk for Energy Markets

Abstract: We introduce the notion of Arakelov motivic cohomology, and discuss the beautiful reformulation (due to Jakob Scholbach) of the Beilinson conjectures on special values of L-functions. 

Andre Suess, Uni. Barcelona, holder et seminar med tittelen: Integration theory for infinite dimensional processes