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Events - Page 8

Time and place: , Blindern

A three-day school for master and PhD students in physics, mathematics and computer science who would like to learn about quantum computing.

Time and place: , Niels Henrik Abels hus, 9th floor

In this talk, I will go through my past research before joining UiO, particularly at The University of Texas at Austin. This will include a brief introduction to the development of stable and adaptive finite element methods for challenging problems in engineering science. Second, I will focus on modeling efforts in coastal ocean hydrodynamics, including a review of the underlying physics and assumption and a review of the current state-of-the-art. I will also introduce several related to my focus of storm surge modeling and how the models are used by stakeholders beyond academia. 

Time and place: , NHA B1120

As a consequence of the S-duality conjecture, Vafa and Witten conjectured certain symmetries concerning invariants derived from spaces of vector bundles on a closed Riemannian four-manifold. For a smooth complex projective surface X, a satisfying mathematical definition of Vafa-Witten invariants has been given by Tanaka and Thomas. Their invariants are a sum of two parts, one of which can be defined in terms of moduli spaces of stable vector bundles on X. Focusing on this instanton part of the VW invariants one can ask how it changes under blowing up the surface X. I will discuss joint work with Oliver Leigh and Yuuji Tanaka that answers this question.

Time and place: , Erling Sverdrups plass, Niels Henrik Abels hus, 8th floor
Time and place: , NHA B1120

I will explain how a recent “universal wall-crossing” framework of Joyce works in equivariant K-theory, which I view as a multiplicative refinement of equivariant cohomology. Enumerative invariants, possibly of strictly semistable objects living on the walls, are controlled by a certain (multiplicative version of) vertex algebra structure on the K-homology groups of the ambient stack. In very special settings like refined Vafa-Witten theory, one can obtain some explicit formulas. For moduli stacks of quiver representations, this geometric vertex algebra should be dual in some sense to the quantum loop algebras that act on the K-theory of stable loci.

Time and place: , Abels utsikt, 12th floor of Niels Henrik Abels hus

On the occasion of Jørund Gåsemyr retiring earlier this year, we invite you to a half-day seminar celebrating his contributions to statistics over many years.

Time and place: , Abels Utsikt (NHA 1259)
Time and place: , Niels Henrik Abels hus, 9th floor

When a body (such as an offshore structure and ship) exists on the surface of the ocean, it is influenced by waves. At the same time, waves are deformed by the body. This interaction is essential for considering the problems of bodies in waves. Although these are complicated systems, the theory is well-established based on linear potential flow, and this explains these phenomena very well.
In the seminar, some applications of potential theory-based analysis are shown, including the seakeeping of a ship, multi-bodies interaction, and elastic plate in waves. In addition, the progress of the study of wave-ice interaction in a marginal ice zone is presented which is a current work in UiO.

Time and place: , NHA 723 and Online
Time and place: , B723
QOMBINE seminar by Franz Fuchs (SINTEF and UiO): An introduction to quantum error mitigation
 
Time and place: , Niels Henrik Abels hus, 9th floor

The survival of green plants depends on the efficient use of photosynthesis in the leaves, where sunlight, water, and CO2 are transformed into sugar – the raw material, which builds up even the largest trees. The dissolved sugars are transported by osmosis through the sieve tubes of the phloem, a vascular system, which runs through the veins of the leaves and on through the stem, all the way down into the roots. The sugar production sites (mesophyll) are distributed over the entire leaf, and it is important for the functionality of the leaf that they are all able to export their sugars. For conifer needles the linear venation architecture makes this challenging, and they have an extra “transfusion tissue” that bridges between production and transport. We are currently studying this complex collection of interdigitated water -and sugar-carrying cells by micro X-ray tomography on intact needles and by network modelling, to understand the pathways for water and for sugars (running in opposite directions) with huge pressure differences (say 3 MPa) across tiny length scales (say 5 microns).

Thomas Bohr is Professor of Physics at the Physics Department of the Technical University of Denmark.

Time and place: , Niels Henrik Abels hus, 9th floor

Diffusion and reactions are central to understanding life. However, studies often focus on dilute systems, while the interior of living cells is crowded with macromolecules that occupy about 20 % to 40 % of the cell volume, affecting virtually all intracellular processes [1]. In this talk, I will mainly focus on diffusion, emphasising the effects significant to crowded intracellular environments, such as polydispersity of crowders [2], macromolecular shapes, interactions [3], and softness [4]. We will also briefly discuss how reactions proceed under crowding, paying particular attention to enzymatic reactions [5] and the cooperativity of divalent binding [6].

Time and place: , NHA B1120
Time and place: , Abels Utsikt (NHA 1259)
Time and place: , Erling Sverdrups plass, Niels Henrik Abels hus, 8th floor
Time and place: , Golden Tulip, Hammamet, Tunisia

The conference is an occasion to bring together researchers in the beautiful Hammamet to discuss on the recent developments in stochastics with applications to mathematical physics and finance

Time and place: , NHA B1120

Abstract (PDF)

Time and place: , B723

Alexander Müller-Hermes will give a talk with title: Capacities of quantum channels

 

Time and place: , Klækken hotell

We are delighted to finally again be able to invite you to the Klækken seminar, October 11 – October 12, 2022.  Klækken seminar is open for young researchers in temporary positions within statistics/biostatistics/bioinformatics at OCBE (UiO and OUS), Institute of Mathematics (UiO), BiAs (NMBU) and RealTek (NMBU).  It is meant as an arena to get to know each other across the institutes and to practice your presentations skills in front of a friendly and harmless audience.

 

Time and place: , Abels Utsikt (NHA 1259)
Time and place: , NHA B1120

Abstract (PDF)

Time and place: , NHA B1120

In 80s Weibel observed that K-theory is homotopy invariant on Fp-schemes up to p-torsion. His main tool was the action of the ring Witt vectors on nil-K-groups: NKi(R) = Ker(Ki(R[t]) → Ki(R)). We will revisit the proof and check that the same result holds for all finitary localizing invariants.

Time and place: , B 1119, Niels Henrik Abels hus, 11th floor
Time and place: , Niels Henrik Abels hus, 9th floor

Stephen Hladky presents work in collaboration with Margery A. Barrand (both Department of Pharmacology, University of Cambridge).

Abstract: Extravascular fluxes of marker substances and some wastes are sufficiently fast that there is almost certain to be a component of flow augmenting their diffusion in the parenchyma. There have been two major proposals for how this flow is produced and where it is important. The evidence for the classical and glymphatic hypotheses will be reviewed. Extravascular, and in particular perivascular, routes for fluid movement out of the parenchyma to lymphatics may be important in the development of hydrocephalus.

Time and place: , NHA 723 and Online