Gjesteforelesninger og seminarer - Side 29

Abstract: For the ax+b semigroup over the natural numbers, which is known to be part of a quasi-lattice ordered group, Laca and Raeburn considered its Nica-Toeplitz algebra and its Cuntz-Nica-Pimsner algebra, with a special appeal to nice presentations by generators and relations as well as the structure of KMS states for a natural dynamics. Shortly thereafter, Brownlowe-an Huef-Laca-Raeburn showed that there are two intermediate quotients between the Nica-Toeplitz algebra and the Cuntz-Nica-Pimsner algebra that exhibit interesting structural properties, especially with regards to KMS states. Since then, analogous quotients have been considered (partly in disguise) in a growing list of case studies on the KMS state structure, e.g. for dilation matrices, self-similar actions, and Baumslag-Solitair monoids. Somewhat surprisingly, all these case studies can be viewed from the perspective of semigroup C*-algebras of right LCM semigroups, and in this talk, I shall describe a unifying perspective on such boundary quotient diagrams. Thereby several questions concerning the general structure of right LCM semigroups are raised.

Fredrik Meyer (UiO), gives the Seminar in Algebra and Algebraic Geometry:

K3 surfaces V: Hodge structures

Dirk Hesse (Data Scientist at Intelligent Communication) will give a seminar in the lunch area, 8th floor Niels Henrik Abels hus at 14:15.

David Ruiz Baños (IMUB, University of Barcelona) gives a talk with the title: "On the regularity of densities of Itô-type processes via stochastic control"

Atanas Iliev, Seoul National University, gives the Seminar in Algebra and Algebraic Geometry: 

Verra 3-folds and EPW quartics 

Salvador Ortiz-Latorre (University of Oslo) is giving his inaugural lecture with the title: High order weak approximation of SDEs

This will be a colloqium-style talk, with pictures, about the classifying spaces and automorphism groups of manifolds, and the relation to surgery theory and algebraic K-theory.   

Andrea Hofmann (HBV) gives the Seminar in Algebra and Algebraic Geometry:

Minimal resolutions for projective models of K3 surfaces in rational normal scrolls

Literature used in the seminar are selected chapters in the book «K3 Projective Models in Scrolls» by Trygve Johnsen and Andreas Leopold Knutsen.

Abstract: As has been observed by many authors, the Drinfeld double of the q-deformation of a compact Lie group can be regarded as a quantization of the complexification of the original Lie group. Using this point of view, I will discuss irreducible unitary representations of these Drinfeld doubles.

Kostiantyn Ralchenko (Taras Shevchenko National University of Kyiv) gives a talk with the title: A generalisation of the fractional Brownian field based on non-Euclidean norms

Yuliya Mishura (Taras Shevchenko National University of Kyiv) gives a lecture with the title: What can happen between two self-similarities?

Geir Ellingsrud (UiO), gives the Seminar in Algebra and Algebraic Geometry:

Projective models of K3-surfaces II

The seminar takes place in the seminar room on the 9th floor of the computer science building.

 

Abstract: We discuss a way of constructing noncommutative projective manifolds as inductive and projective limits, generalizing the so-called Berezin quantization for ordinary compact Kähler manifolds. We first review the physical motivation for Berezin quantization and then discuss how the restriction to commutative manifolds limits the use of this quantization. We will also outline how our more general construction appears naturally in the study of the long-time limit of open quantum systems.

Ingrid Hobæk Haff (UiO, Dept. of mathematics) will give a seminar in the lunch area, 8th floor N.H. Abel's House at 14:15.

Hyperbolic-Elliptic models for two-phase flow in porous media

Geir Ellingsrud, UiO, gives the Seminar in Algebra and Algebraic Geometry:

Projective models of K3-surfaces (after Saint-Donat) 

Bas Jordans will continue his talk from last week.

Potential  flow with free boundaries using the level set method. A review of some electro-hydrodynamic applications 

John Christian Ottem, UiO, gives the Seminar in Algebra and Algebraic Geometry:

Introduksjon til K3-flater (etter Saint-Donat)

Bas Jordans will give a talk with title " Random walks on discrete quantum groups: convergence to the boundary"

Abstract:

For classical random walks there exist two boundaries: the Poisson boundary and the Martin boundary. The relation between these two boundaries is described by the so-called "convergence to the boundary". For random walks on discrete quantum groups both the Poisson boundary and Martin boundary are defined and a non-commutative analogue of convergence to the boundary can be formulated. However, no proof is known for a such a theorem. In the first part of the talk we will discuss the classical and quantum version of convergence to the boundary, explain how these are related and give an overview of what is known in general for the quantum case. In the second part we will discuss the boundary convergence for SUq(2) and for monoidally equivalent quantum groups.

 

Jørgen Vold Rennemo (Oxford), gives the Seminar in Algebra and Algebraic Geometry:

Gauge-dualitet

Kristian Ranestad, UiO, gives the Seminar in Algebra and Algebraic Geometry:

Variety of sums of powers of bihomogeneous forms

Peter Lumsdaine, Stockholms Universitet, vil gi to seminarinnlegg, det ene på logikkseminaret.