Tidligere arrangementer - Side 41

This years Skolem Lecturer lecturer is professor Kit Fine, from New York University. Fine is known for his work in logic, the philosophy of language and metaphysics.

Jens Kaad (Trieste), will give a talk with title "Joint torsion line bundles of commuting operators"

Abstract:

In this talk I’ll associate a holomorphic line bundle to any commuting tuple of bounded operators on a Hilbert space. The transition functions for this bundle are given by the joint torsion which compares determinants of Fredholm complexes. The joint torsion is an invariant of the second algebraic K-group of the Calkin algebra (bounded operators modulo trace class operators). The main step is to prove that the transition functions for the joint torsion line bundle are indeed holomorphic. This is carried out by studying the Quillen-Freed holomorphic determinant line bundle over the space of Fredholm complexes. In particular I will construct a holomorphic section of a certain pull-back of this bundle. The talk is based on joint work with Ryszard Nest.

Magnus D. Norling will give a talk with title "Universal coefficient theorem in KK-theory". This presentation is part of the final act of the course on "The Baum-Connes conjecture and KK-theory".

Bas Jordans will give a talk with title  "Higson's characterization of KK-theory". This presentation is  part of the final act of the course on "The Baum-Connes conjecture and Kasparov's KK-theory".

Steffen Grønneberg (BI Norwegian Business School), gives a seminar in  Auditorium 4, Vilhelm Bjerknes house, at 14:15, Tuesday May 27th:

Econometric inference theories and multiple use of the same data

Professor Harry Zheng (Imperial College, London) holder et seminar med tittelen: Existence and Construction of Smooth Solutions to HJB Equations and Applications 

Professor Yaozhong Hu (University of Kansas) holder et seminar med tittelen: Density convergence for some nonlinear Gaussian stationary sequences

Flow induced vibration (FIV) is a recent discipline in Flow Assurance which focuses on the piping and equipment vibrations caused by the internal flow of gas, oil and/or water in subsea production systems (SPS). Those vibrations may cause fatigue failure at weak spots in the piping such as welds and tees. Due to recent incidents and ever-increasing production rates and velocities, FIV is now considered as a major limiting factor in the design and operation of SPS. Based on real cases and ongoing projects, this presentation provides an introduction to the following aspects: fluid-structure interaction mechanism, fatigue mechanism, design requirements for SPS, analysis tools and vibration monitoring techniques.

Roberto Conti (Sapienza Università di Roma) will give a talk with title:  Asymptotic morphisms in local quantum physics and study of some models

Abstract:

 We discuss a notion of asymptotic morphisms that is suitable for a description of superselection sectors of a scaling limit theory. In some models, this leads to interesting questions about the explicit form of certain modular operators. (This talk is based on joint work with D. Guido and G. Morsella).

Welcome to the Abel Symposium 2014 in Lofoten. The symposium will bring researchers together to discuss statistical analysis for high-dimensional data.

[This is a closed event by invitation only, but a proceedings will be published by Springer (linked here).]

Paul Krühner (UiO) holder et seminar med tittelen: Optimal bounds for SDE's with measurable drift coefficient

Dr. Alexander Schnurr (TU Dortmund) holder et seminar med tittelen: A Canonical Way to Derive Properties of Lévy-Type Processes

Et Eilenberg-Mac Lane rom K(G,n) er bestemt av å ha homotopigruppe G konsentrert i dimensjon n (og 0 ellers), og representerer n-te kohomologi med koeffisienter i G opp til homotopi. Barkonstruksjonen på K(G,n) gir et nytt rom BK(G,n)=K(G,n+1) som selv er en topologisk gruppe. Diagonalen G--->GxG og multiplikasjonen GxG--->G induserer en multiplikasjon på mod p homologigrupper, og gjør denne til en koalgebraisk ring (eller Hopf algebra). Jeg vil konstruere en spektralsekvens av Hopf algebraer (bar spektralsekvensen) som beregner homologi av K(G,n+1) gitt homologi av K(G,n) (for homologiteorier med en Künneth-formel), og vil så beregne mod p-homologi av K(Z,3)=BK(Z,2) som Hopf algebra.   

Professor Massimo Fornasier, from the Technical University of Munich, is visiting the department /CMA. This is his second lecture.

Professor Massimo Fornasier, from the Technical University of Munich, is visiting the department /CMA and he will give two guest lectures.

Martin Jullum (Department of Mathematics, UiO), gives a seminar in  Auditorium 4, Vilhelm Bjerknes house, at 14:15, Tuesday March 4th: 

Parametric or Nonparametric: The Focused Information Criterion Approach

Jan Martin Nordbotten (University of Bergen) will give a talk about

Finite volume methods for elasticity and poro-elasticity

Abstract: We introduce a new class of cell-centered finite volume methods for elasticity and poro-elasticity. This class of discretization methods has the advantage that the mechanical discretization is fully compatible (in terms of grid and variables) to the standard cell-centered finite volume discretizations that are prevailing for commercial simulation of multi-phase flows in porous media. 

For a specific variant of the proposed discretization, we give an overview of a convergence proof in the setting of isotropic elasticity, and address from a theoretical perspective the issues of a discrete Korn's inequality and robustness with respect to locking. Furthermore, we give numerical results for both structured and unstructured grids for both elasticity and poro-elasticity. The talk concludes with an application to simulation of fractured and fracturing porous media.  

Risk measures are set to quantify in terms of assets/money the amount of financial risk associated to a certain financial position. The purposes for such evaluations are many and interesting both from the investors perspectives and regulators. As example, these evaluations are important to quantify the amount of reserve that financial institutions, such as banks or insurance companies, have to set aside as hedging guarantee. In the recent years large attention is given towards convex and coherent risk measures.

A series of 10 lectures will be held by Prof. Giacomo Scandolo, Department of Mathematics, University of Verona (Italy), visiting scholar at our department.

The course is suggested to Master and PhD students in the area of Stochastic Analysis, Insurance, and Risk as well as practitioners in the area.

Torstein Nilssen (Universitetet i Oslo) holder et seminar med tittelen: Malliavin differentiability for a class of SDE's in Hilbert spaces.

A continuation of the previous talk.   

Magnus Landstad will give a talk with title: Quantum groups from almost matched pairs of groups - the groupoid approach

Abstract: If G is a locally compact group with two closed subgroups H,K s.t. G=HK, then (H,K) is called a matched pair of subgroups. The construction of a quantum group from such a pair goes back a long time. We shall look at the more general case where the subgroups are almost matched (the complement of HK in G has measure 0), then a groupoid approach to the construction is very useful and many formulas are obtained for free.

I shall start with explaining the concepts needed (quantum groups, groupoids, etc) and then how the groupoid is constructed. Finally we shall look at the special case where G has a compact open subgroup.

This is joint work with A. Van Daele.

Dongho Chae (Chung-Ang University, Korea) will give a seminar talk entitled

On the self-similar blow-up for the compressible Euler equations

Abstract: The problem of finite time blow-up/global regularity of the 3D incompressible Euler equations is an outstanding problem in mathematical fluid mechanics. On the other hand, the scenario of self-similar type blow-up is a natural candidate of blow-ups in various nonlinear partial differential equations such as the porous medium equation and the nonlinear Schrödinger equations. We also mention that for the closely related incompressible Navier-Stokes equations the question of self-similar blow-up was raised by J. Leray in 1930, and was negatively answered by J. Necas, M. Ruzicka and V. Sverak in 1996. In this talk we present the progress of study during the last several years on the self-similar blow-up for the Euler equations.

Johanna Ridder (University of Oslo) will give a talk about

Analysis of a finite difference method for two-dimensional incompressible magnetohydrodynamics

Abstract: We consider the magnetohydrodynamics equations for a viscous incompressible resistive fluid in two dimensions. For these equations we analyse a semi-discrete finite difference scheme that is based on a staggered grid and is energy preserving. We show an a priori H^1-bound and the convergence of the scheme.