## 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.

This often leads to further mathematical interaction, and in any case it is very interesting to know what one's colleagues are working on.

This implies two things:

- When you speak at the Oberseminar you should try to make sure that your talk is understandable and interesting to everyone, not just to the people in the same field. (We have many specialized seminars where you can present your work at a more technical level.)
- Please always attend the Oberseminar, even if the title of the talk seems technical, because you know that the speaker is going to do a good job. The only reason for absence is that the talk is in your field and thus will be too easy for you.

We hope to see you at the Oberseminar!

Christian Kaiser (organizer)

The directors:

Prof. Ballmann

Prof. Faltings

Prof. Harder

Prof. Hirzebruch †

Prof. Manin

Prof. Teichner

Prof. Zagier

**Upcoming talks**

### Thu, 27 Sep 2018

**Past talks**

For the abstracts click on the titles or see the list of abstracts.

### Thu, 20 Sep 2018

### Thu, 13 Sep 2018

### Thu, 30 Aug 2018

### Thu, 23 Aug 2018

### Thu, 16 Aug 2018

### Thu, 09 Aug 2018

### Thu, 02 Aug 2018

### Thu, 26 Jul 2018

### Thu, 19 Jul 2018

### Thu, 12 Jul 2018

### Thu, 05 Jul 2018

### Thu, 28 Jun 2018

### Thu, 21 Jun 2018

### Thu, 14 Jun 2018

### Wed, 30 May 2018

### Thu, 24 May 2018

### Fri, 18 May 2018

### Thu, 17 May 2018

### Thu, 03 May 2018

### Thu, 26 Apr 2018

### Thu, 19 Apr 2018

### Thu, 12 Apr 2018

### Thu, 05 Apr 2018

### Thu, 29 Mar 2018

### Thu, 22 Mar 2018

### Thu, 15 Mar 2018

### Thu, 08 Mar 2018

### Thu, 01 Mar 2018

### Thu, 22 Feb 2018

### Thu, 15 Feb 2018

### Thu, 01 Feb 2018

### Thu, 25 Jan 2018

### Thu, 18 Jan 2018

### Thu, 11 Jan 2018

### Thu, 14 Dec 2017

### Thu, 07 Dec 2017

### Thu, 30 Nov 2017

### Thu, 23 Nov 2017

### Thu, 16 Nov 2017

### Thu, 09 Nov 2017

### Thu, 02 Nov 2017

### Thu, 26 Oct 2017

### Thu, 19 Oct 2017

### Thu, 12 Oct 2017

### Thu, 05 Oct 2017

### Thu, 28 Sep 2017

### Thu, 21 Sep 2017

### Thu, 14 Sep 2017

### Thu, 07 Sep 2017

### Thu, 31 Aug 2017

## Seminar Geometry and Dynamics

## Working group on Grothendieck-Teichmüller groups

## Learning seminar on deformation theory

Goal of the seminar is to rigoruosly understand the statement ''Every deformation problem in characteristic zero is controlled by a dgla".

#### Contents:

Part I

(Where we see that deformations and dgLa's have something to do with each other)

I.1 - Motivation and 1 or 2 examples of deforming a structure. Maybe Associative algebras, Lie algebras, or complex structures.

I.2 - The deformation functor coming from that example

I.3 - The dgLa coming from that example, and Maurer Cartan equation.

I.4 - The relation between the two.

Part II

(Where we see how to travel between deformation problems and dgLa's)

II.1 - Deformation Functors (another name for formal deformation problems)

II.2 - DgLa's and Chevalley complexes

II.3 - Process A - Maurer-Cartan, or how to get a deformation functor out of a dgLa.

II.4 - Process B - How to get a dgLa out of a deformation functor:

- Step 1 - from free dgLa's to dgArt

- Step 2 - compose Step 1 with the deformation functor F to get a functor from free dgLa's to Simplicial sets. Out of these build a dgLa by some sort of limit, or describing via a resolution by free things.

Part III

(Where we see that A and B are inverse processes up to homotopy)

III.1 - Process B is an equivalence for some formal reasons

III.2 - Intermezzo - technical tools from infinity-categories and homotopy theory

III.3 - The inverse up to homotopy of the process B is process A

#### References:

Jacob Lurie, DAG X: Formal moduli problems

http://www.math.harvard.edu/~lurie/papers/DAG-X.pdf

Bertrand Toën, Problèmes de modules formels

https://perso.math.univ-toulouse.fr/btoen/files/2012/04/Bourbaki-Toen-2016-final1.pdf

Vladimir Hinich, DG coalgebras as formal stacks

https://arxiv.org/pdf/math/9812034v1.pdf

Marco Manetti, Deformation theory via differential graded Lie algebras

http://www1.mat.uniroma1.it/people/manetti/maurer2005.pdf

Damien Calaque, Julien Grivaux, Formal moduli problems and formal derived stacks

https://arxiv.org/abs/1802.09556

Owen Gwilliam and Claudia Scheimbauer's related course/seminar, which has way more references we can look at, and some other stuff too:

https://people.maths.ox.ac.uk/scheimbauer/DAGX.html

## IMPRS seminar on K-theory

## Learning seminar on quantum field theory and BV formalism

The aim of this learning seminar is two fold

1) give a gentle introduction to the basics of quantum field theory (path integral, n-point functions and Wick theorem, Feynman diagrams, gauge fixing and BRST cohomology),

2) present some recent progress related to the BV and BF-BFV formalisms.

We will cover the first part in April and the second one in May.

When?

Every Thursday morning from 10:15 till 12:00 with a 15 minutes break at 11:00

Plan of the talks :

12/04/2018

speaker : Rigel Juarez

Program : Polyak section 1.1-2.3. Preliminaries on classical and quantum field theories, Feynman diagrams in finite dimension (n-point functions and Wick theorem)

19/04/2018

speaker : Danica Kosanovic

Program : Polyak section 2.4-2.10. Adding a potential, cubic potential, general Feynman graphs, weights for graphs, free energy.

26/04/2018

speaker : Alessandro Giacchetto

References :

M. Polyak, Feynman diagrams for pedestrians and mathematicians, Proc. Symp. Pure Math. 73:15-42,2005

This is a twin seminar to a seminar going on in Paris, some additional material can be found at https://sites.google.com/view/groupe-de-travail-bv/r%C3%A9f%C3%A9rences

## Representation theory learning seminar

## MPIM/HIM-Number theory lunch seminar

## Oberseminar Representation Theory

## Arbeitsgruppenseminar Homotopietheorie

## Seminar Aachen-Bonn-Köln-Lille-Siegen on Automorphic Forms

This is the 52nd meeting of the joint French-German seminar on automorphic forms

which is organized by the universities of the five cited cities. Everybody who is interested in

automorphic forms is welcome. We encourage in particular young researchers to participate

and to report on their work in one of our meetings. For further information concerning this

meeting please send an email to moree$@$mpim$-$bonn$.$mpg$.$de

Attachment | Size |
---|---|

abkls52-3.pdf | 398.92 KB |

## ABKSL

Note that ABKLS is part of the 3rd Japanese-German Number Theory Workshop November 20th -- 24th, 2017 Max Planck Institute for Mathematics, Bonn, Germany http://www.ist.aichi-pu.ac.jp/~tasaka/3rdJG/

## New Students at MPIM

## IMPRS seminar

## PLeaSANT (Participative learning seminar analytic number theory)

## Workgroup Seminar Nikolaus

## Informal mini-workshop: A celebration of instantons

Outline: We will have an informal session on instanton gauge theory and various applications to SU(2)-representation varieties of 3-manifolds, and to problems in 3-manifold topology and knot theory. Our aim is to also discuss in more detail some of the technical tools involved.

## Seminar on Kac-Moody algebras and ind-pro-topologies

© MPI f. Mathematik, Bonn | Impressum & Datenschutz |