# Seminar

Series of talks or seminars.

## Friedrich Hirzebruch Lecture

Posted in
Location:
University Club Bonn

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

Posted in
Organiser(s):
C. Kaiser
Date:
Thu, 2013-01-31 15:00 - Thu, 2026-12-31 16:00
Location:
MPIM Lecture Hall

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:

1. 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.)
2. 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 Jun 2019

15:00 - 16:00
Noriko Yui

Past talks

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

### Wed, 19 Jun 2019

15:00 - 16:00
Alexander Koldobsky

### Thu, 13 Jun 2019

15:00 - 16:00
Damian Sawicki, Emily Norton, Severon Barmeier

### Thu, 23 May 2019

15:00 - 16:00
Yuki Hirano, Michael Mertens, Rostislav Devyatov

15:00 - 16:00
Tam Nguyen Phan

15:00 - 16:00
Mark Penney

15:00 - 16:00
Nikolaos Tziolas

15:00 - 16:00
Anna Wienhard
13:45 - 14:45
Christian Bär

15:00 - 16:00
Ferrán Valdez

### Thu, 04 Apr 2019

15:00 - 16:00
Vinoth Nandakamur, Jack Shotton

### Thu, 28 Mar 2019

15:00 - 16:00
Jian Zhang, Laura Pertusi

15:00 - 16:00
Alexander Betts

### Thu, 14 Mar 2019

15:00 - 16:00
Arnab Saha, Riccardo Iraso

### Thu, 07 Mar 2019

15:00 - 16:00
Zhengfang Wang, Andriy Regeta

### Thu, 21 Feb 2019

15:00 - 16:00
Stavros Garoufalidis

15:00 - 16:00
Rekha Biswal

### Thu, 07 Feb 2019

15:00 - 16:00
Pablo Mauricio Zadunaisky, Rouven Frassek, Felix Wierstra

### Thu, 24 Jan 2019

15:00 - 16:00
Yongsheng Zhang, Elizaveta Vishnyakova, Taiwang Deng

### Thu, 17 Jan 2019

15:00 - 16:00
Hongyi Chu, Vladimir Mitankin, Dinh Tuan Huynh

### Thu, 10 Jan 2019

15:00 - 16:00
Hisatoshi Kodani, Panagiotis Polymerakis, Ögmundur Eiriksson

### Thu, 13 Dec 2018

15:00 - 16:00
Martin Gonzales, Evangelos Routi, Marc Stephan

### Thu, 06 Dec 2018

15:00 - 16:00
Arthur Soulie, Roberto Fringuelli, Lorant Szegedy

### Thu, 29 Nov 2018

15:00 - 16:00
Severin Charbonnier, Falk Beckert

### Thu, 15 Nov 2018

15:00 - 16:00
Robin Bartlett, Luca Battistella, Lauren Bandklayder

### Thu, 08 Nov 2018

15:00 - 16:00
Gautier Ponsinet, Carlo Pagano, Alexander Adam

### Thu, 25 Oct 2018

15:00 - 16:00
Charles Fougeron, Christine McMeekin, Joost Nuiten

### Thu, 18 Oct 2018

15:00 - 16:00
Alexandra Kjuchukova, Bingxiao Liu, Fosco Loregian

### Thu, 11 Oct 2018

15:00 - 16:00
Daniel El-Baz, Stefano Marseglia, Diego Izquierdo

### Thu, 04 Oct 2018

15:00 - 16:00
Magnus Carlson, Andrea Ferraguti, Matthew Bisatt

### Thu, 27 Sep 2018

15:00 - 16:00
Sylvaine Lavau, Nicholas Cooney, Nima Rasekh

### Thu, 20 Sep 2018

15:00 - 16:00
Noemie Combe, Tinhinane Azzouz, Alberto Cavallo

### Thu, 13 Sep 2018

15:00 - 16:00
Sheng Meng, Xin Wang, Matthew Young

15:00 - 16:00
Travis Schedler

15:00 - 16:00
Ingrid Irmer

### Thu, 16 Aug 2018

15:00 - 16:00
Tobias Dyckerhoff

### Thu, 09 Aug 2018

15:00 - 16:00
Genki Ouchi, Benjamin Cooper, Mona Merling

15:00 - 16:00
Michael Levin

15:00 - 16:00
Travis Schedler

15:00 - 16:00
Mikhail Bondarko

### Thu, 12 Jul 2018

15:00 - 16:00
Ayberk Zeytin, Roman Fedorov, Yusuf Mustopa

15:00 - 15:50
Curtis McMullen

### Thu, 28 Jun 2018

15:00 - 16:00
Dong Sung Yoon, David Carchedi, Samuel Grushevsky

15:00 - 16:00
Boulos El Hilany

### Thu, 14 Jun 2018

15:00 - 16:00
Linhui Shen, Kwangho Choiy, Sarah Dijols

14:30 - 15:30

### Thu, 24 May 2018

15:00 - 16:00
Dmitry Sustretov, Cary Malkiewich, Yafet Sanchez Sanchez

12:51 - 13:51

15:00 - 16:00
Sergei Gukov

15:00 - 16:00
Dmitri Panyushev

15:00 - 16:00
Peter Zograf

## IMPRS seminar on various topics: infinity-categories

Posted in
Organiser(s):
Christian Kaiser
Affiliation:
MPIM
Date:
Wed, 2019-06-05 14:15 - 15:45
Location:
MPIM Seminar Room

## Seminar on Weighted Hurwitz numbers and topological recursion

Posted in
Organiser(s):
Dan Betea and Danilo Lewanski
Date:
Wed, 2019-05-08 00:00 - 00:01

## IMPRS seminar on various topics: operads

Posted in
Organiser(s):
Christian Kaiser
Affiliation:
MPIM
Date:
Wed, 2019-04-10 16:30 - Fri, 2019-07-12 18:00

## PLeaSANT (Participative learning seminar analytic number theory)

Posted in
Organiser(s):
Pieter Moree, Alisa Sedunova, Efthymios Sofos
Date:
Wed, 2019-01-09 16:30 - Wed, 2020-01-08 17:30
Location:
MPIM Lecture Hall

## Seminar on Topological insulators

Posted in
Date:
Wed, 2019-02-13 14:00 - 18:00

## Seminar on tilting characters of reductive groups

Posted in
Organiser(s):
Hankyung Ko
Date:
Fri, 2019-02-08 15:00 - 18:00
Location:
MPIM Seminar Room

## Geometric recursion learning seminar

Posted in
Organiser(s):
Alessandro Giacchetto and Danilo Lewanski
Date:
Mon, 2018-10-22 14:00 - Fri, 2019-12-20 15:00
Location:
MPIM Lecture Hall

### Content

Geometric Recursion (GR) is a fairly new technique that extends the usual Topological Recursion (TR) theory by means of Teichmüller theory, and relates to several results of Maryam Mirzakhani. It sits in the interplay between many areas of mathematics as mathematical physics, algebraic geometry and category theory.

The first part of the learning seminar aims to define and introduce GR. The second part of the seminar is more open and it will be tailored during the first weeks according to the taste of the participants towards open research questions.

## DyGIT Seminar: (Dynamics, Geometry and Interactions on Tuesdays)

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Organiser(s):
Polyxeni Spilioti, Francisco Javier Torres de Lizaur
Date:
Fri, 2018-10-05 09:02 - Mon, 2019-09-30 10:02

## Seminar Geometry and Dynamics

Posted in
Organiser(s):
Polyxeni Spilioti and Francisco Javier Torres de Lizaur
Date:
Tue, 2018-09-25 16:30 - 17:30
Location:
MPIM Seminar Room

## Working group on Grothendieck-Teichmüller groups

Posted in
Organiser(s):
Noémie Combe
Date:
Fri, 2018-09-21 14:00 - Fri, 2019-02-01 12:30
Location:
MPIM Seminar Room

The idea of this working group is to have an exchange of points of views
concerning a tool which connects both geometric and arithmetic areas.
People who do not necessarily want to give a talk, are also welcome.

## Learning seminar on deformation theory

Posted in
Organiser(s):
Christian Blohmann, Sylvain Lavau, Joao Nuno Mestre, Joost Nuiten
Date:
Thu, 2018-10-04 10:00 - Thu, 2019-02-28 12:00
Location:
MPIM Seminar Room

The goal of the seminar is to rigorously understand the statement ''Every deformation problem in characteristic zero is controlled by a differential graded Lie algebra". This statement has long been a philosophy/guiding principle when studying deformations of algebraic or geometric structures. By the end of the seminar we aim to understand the statement and proof of its following modern incarnation:

Theorem (Lurie, Pridham)
There is an equivalence of $\infty$-categories between the $\infty$-category of formal moduli problems and the $\infty$-category of dgLa's over a field of characteristic zero.

Everyone is welcome, whether to give a talk or simply attend. If you think you'd like to give a talk please come to the first meeting or get in touch with one of the organizers.

#### Contents

In the first part we will see some deformation problems that naturally give rise to dgLa's, and that can also be encoded in deformation functors (also called formal moduli problems). We will see that the two are related by the Maurer-Cartan equation.

In the second part we will study how to construct a deformation functor out of a dgLa using the Maurer-Cartan equation. Conversely, we will build a dgLa out of a deformation functor. For that, we will need to understand some categorical properties of the $\infty$-category of dgLa's - roughly, that we can describe it in terms of generators and relations. This will be done making use of the Chevalley-Eilenberg complex of a dgLa, so that we can work in differential graded local Artinian rings (dgArt) instead.

In the third part we will see that the construction of a dgLa out of a deformation functor is an equivalence of $\infty$-categories between formal moduli problems and dgLa's. Finally, we will see that the inverse of this equivalence is given by the Maurer-Cartan construction.

#### Talks

1. Motivation and examples
2. Deformation Problems and Moduli Problems  (Notes by Alex)
3. Deformation functors - Modern approach and the MC equation (Notes by Joao)
4. The Chevalley-Eilenberg complex $C^*$, and how it is related to the Maurer-Cartan equation (Notes by Joost)
5. The model category dgLa
6. Koszul duality I - $C^*$ and its adjoint
7. Koszul duality II - $C^*$ is an equivalence (sometimes) (Notes by Sylvain)
8. Proof of the equivalence in the Main Theorem, part 1(Notes by Christian)
9. Proof of the equivalence in the Main Theorem, part 2 (Notes by David)
10. The inverse of the equivalence is given by Maurer-Cartan

#### References

On classical/motivating examples:

Historical:

## Master thesis seminar

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Date:
Wed, 2018-07-25 14:00 - 15:30
Location:
MPIM Seminar Room

## IMPRS seminar on K-theory

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Organiser(s):
Christian Kaiser
Date:
Thu, 2018-04-12 16:30 - Thu, 2018-07-19 18:00
Location:
MPIM Seminar Room

## Learning seminar on quantum field theory and BV formalism

Posted in
Organiser(s):
C. Blohmann, Y. Frégier and M. Schiavina
Date:
Thu, 2018-04-05 10:15 - Thu, 2018-05-31 18:04
Location:
MPIM Seminar Room

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 :

Déformation, Quantification, Théorie de Lie Alberto Cattaneo - Bernhard Keller - Charles Torossian - Alain Bruguières Panoramas et Synthèses 20 (2005)

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

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Organiser(s):
Hankyung Ko, Emily Norton, Thorsten Heidersdorf

## MPIM/HIM-Number theory lunch seminar

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Organiser(s):
MPIM, HIM
Date:
Wed, 2018-01-10 14:15 - Wed, 2018-04-18 15:15
Location:
MPIM Lecture Hall

## Oberseminar Representation Theory

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Organiser(s):
C. Stroppel
Date:
Tue, 2018-01-23 16:15 - 18:15
Location:
MPIM Lecture Hall

## Arbeitsgruppenseminar Homotopietheorie

Posted in
Organiser(s):
Thomas Nikolaus
Date:
Thu, 2017-12-07 10:15 - 11:45
Date:
Thu, 2017-12-14 10:15 - 11:45
Date:
Thu, 2017-12-21 10:15 - 11:45
Date:
Thu, 2017-12-28 10:15 - 11:45
Date:
Thu, 2018-01-04 10:15 - 11:45
Date:
Thu, 2018-01-11 10:15 - 11:45
Date:
Thu, 2018-01-18 10:15 - 11:45
Date:
Thu, 2018-01-25 10:15 - 11:45
Date:
Thu, 2018-02-01 10:15 - 11:45
Location:
MPIM Seminar Room
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