Gjesteforelesninger og seminarer - Side 42

For simplisielle mengder X og Y gir projeksjonene X x Y -> X og X x Y -> Y fra produktet ned på henholdsvis første og annen faktor opphav til en simplisiell avbildning f : Sd( X x Y ) -> Sd X x Sd Y fra den normale oppdelingen av produktet til produktet av oppdelingene. Vi viser at for endelige simplisielle mengder X og Y er denne en simpel avbildning, det vil si at når vi går over til topologiske rom så er punktinversene |f|^{-1}(p), p element i |Y|, kontraktible. 

Sjur Westgaard (NTNU) skal snakke om

Modelling and forecasting electricity price risk using volatility adjusted quantile regression

In nature, groups of individuals organize globally using only local information. For instance, in a school of fish, there are no external forces to coordinate the group, no leader to guide them. Several mathematical models have been proposed to describe self-organization. In this talk, we will consider two of the most famous models; the Keller-Segel model for bacterial chemotaxis and the Cucker-Smale model for flocking. The emphasis will be on recent mathematical results and remaining open questions. Starting from the microscopic description on particle level, we will discuss the derivation of mesoscopic and macroscopic models at the continuum level. Since the motivation for deriving continuum models is largely numerical, we will also discuss distinct numerical challenges with the resulting models.

The gas pipeline from the Ormen Lange Field to the terminal at Aukra faced several challenges. First, the terrain was very rugged as the route goes through the Storegga slide area where unprecedented long free spans were to be expected. Secondly, the area was believed to have complicated and strong ocean currents. An oceanographic campaign was started in 1999 and lasted to 2007. The presentation will give some background for the measurements, describe the programme and show some results.

Jan Pedersen, Uni. Aarhus, holder et seminar med tittelen:  Stochastic integration on the real line

Erik Vanem (Matematisk Institutt, Universitetet i Oslo) skal snakke om

A Bayesian hierarchical space-time model of significant wave height

Rodwell Kufakunesu, Uni. Pretoria, holder et seminar med tittelen: On Embedded Options - Do We Really Need Jumps And Stochastic Volatility?

Raouf Ghomrasni, AIMS (Cape Town),  holder et seminar med tittelen: A generalized occupation time formula 

Takuji Arai, Uni. Keio, holder et seminar med tittelen: An explicit representation of locally risk-minimizing hedging strategy for Levy markets

Peter Guttorp (University of Washington og Norsk Regnesentral) skal snakke om

The role of statisticians in international science policy

This lecture series will be based on the introduction, chapters 1 and 2 of the book "Topics in Optimal Transportation" by Cedric Villani.

Roberto Conti , Università di Chieti-Pescara ‘G. D’Annunzio’, Italy, will give a talk on "Sectors of scaling limit nets and asymptotic morphisms".

 

Abstract: In the algebraic approach to 4D-QFT the main object of study is a local net, namely an isotonous correspondence between spacetime regions and operator algebras on a fixed Hilbert space satisfying physically motivated properties including Einstein causality. The so-called DHR superselection sectors of the net are then described by certain (inner equivalence classes of) *-endomorphisms of the C*-algebra of quasi-local observables. For any local net, one may also consider its associated scaling limit nets, carrying the information on the short distance limit of the given QFT (roughly, this is the algebraic version of the renormalization group). In this talk we will argue that the superselection sectors of a scaling limit net can be described in terms of suitable maps of the original theory, that are similar to the asymptotic morphisms appearing in E-theory of Connes and Higson. This is a new arena where concepts from AQFT and NCG are merged together, and provides a first step for an alternative (rigorous, model independent) approach to the notion of confinement. (This is joint work with G. Morsella).  

Kukatharmini Tharmaratnam (Matematisk Institutt, Universitetet i Oslo) skal snakke om

Robust estimation for penalized regression splines

Jukka Lempa, CMA, holder et seminar med tittelen: Utility maximization with commodity futures

This lecture series will be based on the introduction, chapters 1 and 2 of the book "Topics in Optimal Transportation" by Cedric Villani.

Professor Jouko Väänänen, Helsinki, vil forelese på logikkseminaret om Dependence Logic.

Jukka Lempa,CMA, holder et seminar med tittelen:Optimal Stopping with Random Exercise Lag

This lecture series will be based on the introduction, chapters 1 and 2 of the book "Topics in Optimal Transportation" by Cedric Villani.

I extend my 2005 AG&T paper with Bruner from the circle case to more general Lie groups.  There are new results about infinite cycles for actions by the torus T² or the rotation group SO(3).