## Upcoming Talks

Abstracts of upcoming talks at the MPIM. For an overview see also the calendar.

## Recent developments in Quantum Topology -- Cancelled --

We will review the basics of quantum topology such as the colored Jones polynomial of a knot, its standard conjectures relating to asymptotics, arithmeticity and modularity, as well as the recent quantum hyperbolic invariants of Kashaev et al, their state-integrals and their structural properties. The course is aimed to be accessible by graduate students and young researchers.

## Applications of virtual fundamental classes to enumerative geometry

The aim of this talk is to show why understanding the construction of a virtual fundamental class is useful: firstly we do this via computing these in some examples of moduli spaces of stable maps and secondly by linking these classes to Gromov-Witten invariants and thus to certain problems in enumerative geometry. I will start with a recap from the summer (17th August), when moduli spaces of stable maps were introduced, giving explicit examples along the way.

## Cut and paste invariants of manifolds via algebraic K-theory

Recent work of Campbell and Zakharevich has focused on building machinery for studying scissors congruence problems via algebraic K-theory. Their main application was the study of the Grothendieck ring of varieties. In this talk, I will present an application of their framework to the study of cut and paste invariants of manifolds. In particular, I will talk about the construction of a spectrum that recovers the classical "cut and paste" groups for manifolds on \pi_0.

## Equivariant bordism, multiplicative gerbes and topological electronic structures of crystals

In this talk I will give a short presentation of who I am and the main mathematics subjects that have interested me.

## Tame geometry and Hodge theory

Originating in Grothendieck's "Esquisse d'un programme", tame geometry has been developed by model theorists under the name "o-minimal structures". It studies structures where every definable set has a finite geometric complexity. It has for prototype real semi-algebraic geometry, but is much richer.

## An Automorphic translation of Deligne’s conjecture: Special values of L-function attached to an automorphic representation of GL_N over a number field

Zoom Meeting ID: 919 6497 4060

For password see the email or contact Pieter Moree (moree@mpim...).

## Lie algebra action

Meeting ID: 997 9940 1217

For passcode contact Christian Kaiser (kaiser@mpim...)

## Generic regularity of min-max minimal hypersurfaces

Minimal hypersurfaces in 8-dimensional Riemannian manifolds may have isolated singularities. However, it follows from the results of R. Hardt, L. Simon and N. Smale that one can perturb away singularities of an area minimizing minimal hypersurface by a small change of the metric. I will talk about a similar problem for min-max minimal hypersurfaces (joint work with Otis Chodosh and Luca Spolaor). We show that for a generic 8-dimensional Riemannian manifold with positive Ricci curvature, there exists a smooth minimal hypersurface.

## W algebras and integrable structures

https://hu-berlin.zoom.us/j/61339297016

## Beauville decomposition: proof via Fourier-Mukai

Meeting ID: 997 9940 1217

For passcode contact Christian Kaiser (kaiser@mpim...)

## Mathematical events in Bonn

##### Bonn Mathematics Calendar

All mathematical events in Bonn are listed in the Bonn Mathematics Calendar. For directions see the map.

##### University Calendar

All lectures and courses at Bonn University can be found in the university calendar.

## Recurring seminars, series and courses

Detailed list of recurring seminars, series of talks, and courses or lectures comprising multiple talks. For an overview see also the calendar.

## Friedrich Hirzebruch Lecture

The annual Friedrich Hirzebruch Lecture is a series of lectures started in 2007 on the occasion of the 80th birthday of Prof. Friedrich Hirzebruch. The lectures address a general audience and aim at illustrating the relation between mathematics and art, society and other fields.

## MPI-Oberseminar

The Oberseminar is a very long running seminar at MPI (‘Ober‘ standing for 'upper'). Its idea is that the guests of the MPI speak in this seminar (hopefully early in their stay) and get the chance to explain their work to the other guests.

## A study group on Milnor invariants

## IMPRS seminar on various topics: Hitchin systems

## Extra talk

## Representation theory learning seminar

## IMPRS Minicourse

## Seminar on Algebra, Geometry and Physics

## Archived Events

To narrow the list of events displayed please select year and event type or fill the search fields, then press *Apply*.

## MPI-Oberseminar

The Oberseminar is a very long running seminar at MPI (‘Ober‘ standing for 'upper'). Its idea is that the guests of the MPI speak in this seminar (hopefully early in their stay) and get the chance to explain their work to the other guests.

## Friedrich Hirzebruch Lecture

The annual Friedrich Hirzebruch Lecture is a series of lectures started in 2007 on the occasion of the 80th birthday of Prof. Friedrich Hirzebruch. The lectures address a general audience and aim at illustrating the relation between mathematics and art, society and other fields.

## tba

## Non-abelian Abel's theorems and quaternionic rotation

https://hu-berlin.zoom.us/j/61339297016

## Holomorphic curves, boundaries, skeins, and recursion

https://hu-berlin.zoom.us/j/61339297016

## Combinatorics, Lefschetz theorems beyond positivity and transversality of primes

https://hu-berlin.zoom.us/j/61339297016

## Uryson width and volume

The Uryson width of an n-manifold gives a way to describe how closely it resembles an (n−1)-dimensional complex. It turns out that this is a useful tool to approach several geometric problems.

## Beauville decomposition: proof via Fourier-Mukai

Meeting ID: 997 9940 1217

For passcode contact Christian Kaiser (kaiser@mpim...)

## W algebras and integrable structures

https://hu-berlin.zoom.us/j/61339297016

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