Tidligere arrangementer - Side 125

Roberto Conti , Universit¨¤ 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

Robertus Erdelyi, Head of Solar Physics and Space Plasma Research Centre in the Applied Mathematics Department at the University of Sheffield (UK).

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

CEES Extra seminar by Nancy G. Solomon

Professor Jouko V??n?nen, Helsinki, vil forelese p? logikkseminaret om Dependence Logic.

CEES Extra seminar by Linda N?stebakken

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

Sven Wedemeyer-B?hm, Institutt for teoretisk astrofysikk

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). 

Friday seminar by Barbara Bramanti

Per Lilje, Institutt for teoretisk astrofysikk, UiO

CEES Extra seminar by W. Ryan Easterday

I will go through the simplest case of my 2005 AG&T paper with Bruner, showing that certain classes, in the homological homotopy fixed point spectral sequence for a circle action on a commutative ring spectrum, are infinite cycles. The idea of using an universal example may lead to generalizations for actions by tori or other Lie groups. 

CEES Extra seminars by Janusz Uchma¨½ski & Mats Gyllenberg

Dag Sverre Seljebotn, Institutt for teoretisk astrofysikk, UiO

CEES Extra seminar by Mihaela Pavlicev

R¨¹diger Kiesel,Uni. Essen/CMA, holder et seminar med tittelen: Market Risk Premium in Power Markets

Torben Mideksa (Cicero) skal snakke om

Electricity demand in a changing climate

We show that the hermitian K-theory of regular schemes (with 2 a unit in the ring of regular functions) is represented in the A^1-homotopy category of Morel-Voevodsky by the ind-scheme of non-degenerate Grassmanians.