Universität Bonn

Events Calendar

April 2024

Location: MPIM Lecture Hall

Location: MPIM Lecture Hall

Location: MPIM Seminar Room

Location: Endenicher Allee 60, Raum 2.025

Abstract:
Magnetohydrodynamics plays a crucial role in understanding the behavior of plasmas, electromagnetic fields, and fluid dynamics, providing a fundamental framework for studying phenomena in astrophysics, fusion energy, and space exploration. In this talk, we will present a short survey about the well-posedness of boundary value problems for steady ideal magnetic fluids. More precisely, we will first focus on the magneto-hydrostatic equations (in two and three dimensions) and conclude with some ongoing work related to the steady magneto-hydrodnamic equations.

Location: MPIM Lecture Hall

Location: MPIM Lecture Hall

Location: 1.008, Endenicher Allee 60

Abstract: 
Given an abelian category C of low homological dimension, one can construct a cohomological Hall algebra (CoHA) of C, whose product encodes extensions between objects in C. An important example of such C is the category Coh(S) of coherent sheaves on a smooth surface S. While understanding its CoHA algebraically is more or less hopeless for a general S, we can restrict our attention to the CoHA of 0-dimensional sheaves. I will give an explicit description of this algebra, which builds on the seminal work of Nakajima and Lehn. I will also discuss how this description can be used to deduce structural results about cohomology of moduli spaces of sheaves with positive-dimensional support on S, such as our recent proof of P=W conjecture. This is a report on joint work with A. Mellit, O. Schiffmann and E. Vasserot.

Location:  Lennéstr. 2, Seminarraum, 1st floor.

Abstract: 
Flow time measures the duration from release until completion of a job. It is one of the most natural, but also most notorious objectives in scheduling. A long-standing open question in the field was to obtain a polynomial time constant approximation for total weighted flow time on a single machine. This was recently solved in a combination of a tour-de-force of Batra, Garg, and Kumar and a clever instance reduction by Feige, Kulkarni, and Li. In joint work with Armbruster and Wiese, we improved this to a PTAS and recently also obtained a surprisingly simple constant approximation algorithm, which I will present. Afterwards, I will briefly discuss settings with several parallel machines and, in particular, recent joint work with Bansal and Svensson that points out connections to Discrepancy theory.

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Location: INS, Friedrich-Hirzebruch-Allee 7, Raum 2.04

Location: Endenicher Allee 60, Lipschitz Lecture Hall

Abstract:
The talk deals with the issue of existence for the sliding Plateau problem. We work in the Euclidean space RN, we fix a compact set Γ⊂ RN (the boundary), an integer d = 1,...N-1 and an initial compact set E ⊂ RN. spanning Γ such that Hd(E0) < +∞. The associated sliding Plateau problem consists in minimizing Hd(E), among sets E = f(E0), where f : E0 → RN is a Lipschitz map (a sliding deformation) such that there exists a continuous homotopy F : E0 x [0,1] → RN satisfying F0 = id, F1 = f, and Ft(E0 ∩ Γ) ⊂ Γ ∀ t ∈ [0,1]. In other words, F is a continuous deformation of E0 which is not allowed to detach E0 from the boundary. One of the motivations for this formulation is that it is suitable to describe soap films spanning a boundary and their singularities. However, the direct method of the calculus of variation is difficult to apply because the Hausdorff measure is not lower semicontinuous with respect to the Hausdorff convergence of sets, and more importantly, because a limit of sets Ei = fi(E0) may not be of the form f(E0). The goal of the talk is to present a proof of existence when d = 2 and under some assumptions on the boundary Γ. This is a joint work in preparation with G. David.

Location: Endenicher Allee 60, Lipschitz hall

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Location: Auditorium MPI

Abstract:  
The moduli space of rank n local systems on a topological surface admits an action of a huge group, namely the mapping class group. The finite orbits of this action then correspond to very special points in the moduli space. This is a generalization of the classical question of finding algebraic solutions to the Painlevé VI equation, which corresponds to n = 2 and the surface being the 4-punctured sphere. I’ll discuss joint work with Aaron Landesman and Daniel Litt, in which we classify all finite orbits in the case when n=2 and the Riemann surface is a punctured P^1, under a mild assumption. This extends previous work of Dubrovin—Mazzocco and Lisovvyy—Tykhyy, though our techniques are rather different and essentially Hodge theoretic.

Location: INS, Friedrich-Hirzebruch-Allee 7, Raum 2.035

Location: Endenicher Allee 60, Lipschitzsaal

Link to the poster

Location: Endenicher Allee 60, 1.008 

Abstract: 
This is a joint work with Catharina Stroppel. Naisse and Vaz defined an extension of KLR algebras that categorify Verma modules. They do this by introducing an extra generator, the "floating dot," into the diagrammatic calculus. We find a geometric meaning of this upgrade as a convolution algebra in Borel-Moore homology. This talk is not about the categorifications Verma modules. This is about the geometric construction of the algebra that categorifies Verma modules.

Location: Endenicher Allee 60, Lipschitz hall

Abstract:
Angesichts der aktuellen Herausforderungen und Diskussionen zu frühkindlicher Bildung, zum allgemeinbildenden Mathematikunterricht und geeigneter Lehrkräftebildung bis hin zu Problemen am Übergang Schule-Universität gerade für mathematikintensive Studienfächer kann es hilfreich sein, einen Blick zurück in die Entwicklungsgeschichte der Mathematikdidaktik in Deutschland nach dem 2.Weltkrieg zu werfen. Es zeigt sich, dass einige der heute aktuellen Fragen gar nicht so neu sind. Hintergrund des Vortrags ist das gleichlautende Kapitel im Handbuch der Mathematikdidaktik (2.Auflage 2023). In Verbindung mit einem fokussierten Überblick über markante historische Entwicklungen der Gegenstände, Methoden und Wirkungsweisen der Mathematikdidaktik im Westen und der Mathematikmethodik im Osten Deutschlands bis 1990 werden im Vortrag mögliche Folgerungen für künftige Entwicklungen begründet und diskutiert.

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Location: Endenicher Allee 60, Lipschitz hall

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Location: HIM lecture hall (Poppelsdorfer Allee 45, Bonn)

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Location: Endenicher Allee 60, Hausdorff room

Abstract:
We invite all female* mathematicians to the next Tea Time with the title “Meet your Profs”. You will get the opportunity to network with fellow students and some of Bonn’s maths professors namely Prof. Vargas Koch, Prof. Sauermann, Prof. Rüland and Prof. Verfürth. The event will take place on April 26th from 2:30 to 5 pm in the Hausdorff-room. There will be tea and cookies for you to enjoy. Feel free to drop by whenever you want!

*All female, intersexual, non-binary and agender persons are invited.

May 2024

Location: MPIM Lecture Hall

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Location: HIM lecture hall (Poppelsdorfer Allee 45, Bonn)

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Location: MPIM Lecture Hall

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Location: HIM lecture hall (Poppelsdorfer Allee 45, Bonn)

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Location: Endenicher Allee 60, Lipschitz hall

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Location: Endenicher Allee 60, Lipschitz hall

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June 2024

Invited Speakers:

  • Mirela Ben-Chen (Technion Israel Institute of Technology)
  • Sergio Conti (University of Bonn)
  • Patrick Dondl (Albert-Ludwigs-Universität Freiburg)
  • Martin Metscher (MTU Aero Engines AG)
  • Felix Otto (Max-Planck-Institut für Naturwissenschaften)
  • Tobias Preußer (Fraunhofer Institute for Digital Medicine MEVIS)
  • Carola-Bibiane Schönlieb (University of Cambridge)
  • Peter Schröder (California Institute of Technology)
  • Rüdiger Schultz (Universität Duisburg-Essen)
  • Gabriele Steidl (Technische Universität Berlin)
  • Robert Strzodka (Universität Heidelberg)
  • Max Wardetzky (Universität Göttingen)
  • Barbara Zwicknagl (Humboldt-Universität zu Berlin)

Location: Lipschitz hall, Endenicher Allee 60, 53115 Bonn

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Location: Endenicher Allee 60, Lipschitz hall

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Location: Endenicher Allee 60, Lipschitz hall

Abstract:
Fortschritte in der Mathematik beginnen nicht selten damit, dass man etwas Alltägliches, an dem man sonst achtlos vorübergeht, einmal genauer untersucht. Auch hinter einfachen, elementaren Fragen versteckt sich nicht selten schöne und zuweilen anspruchsvolle Mathematik. Davon ausgehend begeben wir uns auf einen Streifzug durch einige kurzweilige Themen der Mathematik.

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Location: Endenicher Allee 60, Lipschitz hall

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Location: HIM lecture hall (Poppelsdorfer Allee 45, Bonn)

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Location: Endenicher Allee 60, Lipschitz hall

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July 2024

Invited Speakers:

  • Jon Brundan (University of Oregon)
  • Shun-Jen Cheng (Academia Sinica)
  • Kevin Coulembier (University of Sydney)
  • Maria Gorelik (Weizmann Institute)
  • Victor Kac (MIT)
  • Jonathan Kujawa (University of Oklahoma)
  • Andrew Manion (NC State University)
  • Jonas Nehme (University of Bonn)
  • Shifra Reif (Bar-Ilan University)
  • Lev Rozansky (University of Chapel-Hill)
  • Siddharta Sahi (Rutgers University)
  • Hadi Salmasian (University of Ottawa)
  • Vera Serganova (University of California, Berkeley)
  • Alexander Sherman (University of Sydney)

Location: Lipschitz hall, Endenicher Allee 60, 53115 Bonn

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Location: Endenicher Allee 60, Lipschitz hall

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Location: Lennéstr. 2, Seminarraum

Link (incl. Abstract)

Invited Speakers:

  • Michael Christ (UC Berkeley)
  • Philip Gressman (U. Penn)
  • Ian Petrow (UCL)
  • James Wright (U. Edinburgh)
  • Ruixiang Zhang (UC Berkeley)
  • Polona Durcik (Chapman University)
  • Dóminique Kemp (UW Madison/IAS/Princeton)
  • Dominique Maldague (MIT)
  • Hong Wang (UCLA)

Location: Lipschitz hall, Endenicher Allee 60, 53115 Bonn

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Location: HIM lecture hall (Poppelsdorfer Allee 45, Bonn)

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Location: Endenicher Allee 60, Lipschitz hall

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Invited Speakers:

  • Jonathan Bennett (University of Birmingham)
  • Xiumin Du (Northwestern University)
  • Malabika Pramanik (UBC)
  • Andreas Seeger (UW Madison)

Location: Lipschitz hall, Endenicher Allee 60, 53115 Bonn

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Location: Endenicher Allee 60, Lipschitz hall

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Location: MPIM Lecture Hall

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Location: HIM lecture hall (Poppelsdorfer Allee 45, Bonn)

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August 2024

Location: HIM lecture hall (Poppelsdorfer Allee 45, Bonn)

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September 2024

Location: MPIM Lecture Hall 

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Invited Speakers:

•    Alice Guionnet (Ecole Normale Supérieure Lyon)
•    Ioan Manolescu (University of Fribourg)
•    
Eliran Subag (Weizmann Institute of Science, Israel)
•    
Simone Warzel (Technical University of Munich)

Location: Lipschitz hall, Endenicher Allee 60, 53115 Bonn

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Location: HIM lecture hall (Poppelsdorfer Allee 45, Bonn)

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Location: HIM lecture hall (Poppelsdorfer Allee 45, Bonn)

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Invited Speakers:

  • Adolfo Arroyo-Rabasa (Catholic University of Louvain)
  • Annika Bach (Eindhoven University of Technology)
  • Giulia Bevilacqua (University of Pisa)
  • Elise Bonhomme (Free University of Brussels)
  • Camilla Brizzi (Technical University of Munich)
  • Elia Brué (Bocconi University, Milan)
  • Leon Bungert (University of Würzburg)
  • Sara Daneri (University of L’Aquila)
  • Cristiana De Filippis (University of Parma)
  • Annette Dumas (University Claude Bernard, Lyon )
  • Katharina Eichinger (Polytechnic School, Paris)
  • Xavier Fernandez-Real (EPFL - Swiss Federal Institute of Technology, Lausanne)
  • André Guerra (Institute for Theoretical Studies, ETH, Zurich)
  • Jasper Hoeksema (Eindhoven University of Technology)
  • Domenico Angelo La Manna (University of Naples, Federico II)
  • Tim Laux (University of Regensburg)
  • Alice Marveggio (HCM, Bonn)
  • Roberta Marziani (University of L’Aquila)
  • Mircea Petrache (Catholic Chile Univesity, Santiago)
  • Simone Rademacher (Ludwig Maximilian University of Munich)
  • Sebastian Schwarzacher (Charles University, Prague)
  • Bozhidar Velichkov (University of Pisa)

Location: Endenicher Allee 60, Lipschitz hall

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October 2024

Location: HIM lecture hall (Poppelsdorfer Allee 45, Bonn)

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November 2024

Location: HIM lecture hall (Poppelsdorfer Allee 45, Bonn)

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Location: HIM lecture hall (Poppelsdorfer Allee 45, Bonn)

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December 2024

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