Arrangementer

Kommende 5 dager

20 jan.
Tid og sted: 20. jan. 2022 14:1516:00, NHA B1120
Hilbert schemes of points for a surface are a well studied subject with many famous results like Göttsche’s formula for its Betti numbers. A natural generalization comes from studying Grothendieck’s Quot-schemes and the associated enumerative invariants. Unlike the former, punctual Quot-schemes are smooth only virtually admitting perfect obstruction theories and virtual fundamental classes. This has recently been used to study invariants counting zero-dimensional quotients of trivial vector bundles by multiple authors who used virtual localization and therefore could not treat the case of a general vector bundle. We rely on other techniques which use a general wall-crossing framework of D. Joyce to study these. Our methods rely on existence of a Lie algebra coming from vertex algebras constructed out of topological data. I will explain how these arise naturally in the Quot-scheme setting and how one can obtain explicit invariants and study their symmetries.
21 jan.
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Tid og sted: 21. jan. 2022 11:0012:00, Online

Flere kommende arrangementer

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Tid og sted: 4. feb. 2022 11:0012:00, Online
Tid og sted: 30. mai 2022 08:001. juni 2022 16:00, University of Oslo

You are cordially welcome to participate in this three-day conference on climate, weather and carbon risk in energy and finance. The conference will gather academics and practitioners, discussing the latest advances on the stochastics of risk measuring, modeling and managing, with a focus on energy systems, markets and finance (ESG).

Key topics involve modelling uncertainty in weather and climate, optimisation problems related to energy systems to control emissions, as well as measuring risk factors related to climate change. 

There will be several invited talks by leading researchers as well as selected contributed talks by participants.

 

Nils Henrik on a sunny day
Tid og sted: 12. sep. 202214. sep. 2022, The Norwegian Academy of Science and Letters

A conference in honour of Nils Henrik Risebro on the occasion of his 60th birthday.