Tidligere arrangementer - Side 94
Ainar Drews, PhD , ITA
Abstract: In a recent work with R. Conti (La Sapienza Univ., Rome), we have introduced a notion of positive definiteness for certain functions associated to a (unital, discrete) C*-dynamical system. We will sketch the proof of a Gelfand-Raikov type theorem for such functions and use it to construct complete positive maps on the full and the reduced C*-crossed products of the system. We will also explain how a natural definition of amenability for C*-dynamical systems emerges from our work.
PET ligands for imaging Alzheimer’s disease – neuropathological validation.
Abstract:
Marit Sandstad, Postodoctoral fellow NORDITA
By Fabienne Krauer from Institute of Social and Preventive Medicine (ISPM), University of Bern, Switzerland
Timo Koski (Dept. of Mathematics, Royal Institute of Technology, Stockholm) will give a seminar in the lunch area, 8th floor Niels Henrik Abels hus at 14:15.
Jack Carlyle, Postdoc , ITA
A Scandinavian Gathering Around Remarkable Discrete Mathematics
Abstract: The talk will be on positive linear maps of the n x n matrices into itself, a topic which has become quite popular in quantum information theory. The maps closest to physics are the completely positive ones. I?ll discuss an approximation by a completely positive map to a positive map via the trace , called the “structural physical approximation”, the SPA of the map. Much of the talk will circle around a counter example to a conjecture on the SPA.
Sofia Tirabassi (UiB), gives the Seminar in Algebra and Algebraic Geometry:
Title: Characterization of product of theta divisors
Abstract: This is a joint work with Z. Jiang and M. Lahoz. We give a new cohomological characterization of product of theta divisors in principally polarized abelian varieties and we completely classify n-varieities with of maximal albanese dimension and with irregularity 2n-1 and euler characteristic 1, extending lower dimensional results of Hacon--Pardini. I will do my best to keep the first hour enjoyable and entertaining also for graduate students with background in algebraic geometry (and related areas).
Anders Holmberg (Statistics Norway, SSB) will give a seminar in the lunch area, 8th floor Niels Henrik Abels hus at 14:15.
By Martijn van de Pol & Callum Lawson
Karl Ove Moene, Professor - Centre for the Study of Equality, Social Organization, and Performance
Abstract: In the classification program for C*-algebras some of the usual assumptions put on the algebras are that they are simple or have at most have finitely many ideals. We often also want algebras that have real rank 0. In this talk we will discuss how to classify certain graph algebras with uncountably many ideals and without real rank 0. There will be examples and applications. Joint work with S. Eilers, G. Restorff, and E. Ruiz
Adriana Lopes dos Santos, Post Doc, Station Biologique, Roscoff, France
By Mike Benton (Note the time and venue!)
Kristine Beate Walhovd, Professor - Department of Psychology
J?rgen Vold Rennemo (Oxford) gives the Seminar in Algebra and Algebraic Geometry:
K3 surfaces seminar: The moduli spaces of polarized K3 surfaces
Abstract: There are many interesting examples of groups acting on trees, arising in various fields (e.g. combinatorial group theory, number theory, geometry). When a group acts on a tree, it necessarily also acts on the boundary of the tree, a (totally disconnected) compact Hausdorff space. The C*-algebras obtained from the crossed product construction include many fundamental examples. I will describe methods for analyzing such crossed products, developed in joint work with Nathan Brownlowe, Alex Mundey, David Pask and Anne Thomas.
Manuela Zucknick (Dept. of Biostatistics, UiO) will give a seminar in the lunch area, 8th floor Niels Henrik Abels hus at 14:15.
Aimee A. Norton, Stanford University
Ricardo Gafeira (Max Planck Institute for Solar System Research)
Arvid Siqveland (HBV), gives the Seminar in Algebra and Algebraic Geometry:
K3 surfaces seminar: Endomorphism fields and Mumford–Tate groups II
By Mikael Fortelius