# Events

Conferences, seminars, talks and other events at the MPI for Mathematics

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## Higher Geometric Structures along the Lower Rhine XI, March 8-9, 2018

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Organiser(s):
Christian Blohmann, Marius Crainic, Ioan Marcut, Ieke Moerdijk, Steffen Sagave
Date:
Thu, 2018-03-08 13:45 - Fri, 2018-03-09 17:00
Location:
MPIM Lecture Hall

This is the eleventh of a series of  short workshops jointly organized by the Geometry/Topology groups in Bonn, Nijmegen, and Utrecht, all situated along the Lower Rhine. The focus lies on the development and application of new structures in geometry and topology such as Lie groupoids, differentiable stacks, Lie algebroids, generalized complex geometry, topological quantum fi eld theories, higher categories, homotopy algebraic structures, higher operads, derived categories, and related topics.

## Conference on Arithmetic and Automorphic Forms on the occasion of Günter Harder's 80th birthday, March 12 - 14, 2018

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Organiser(s):
W.Ballmann, M.Rapoport, and J. Schwermer
Date:
Mon, 2018-03-12 08:00 - Wed, 2018-03-14 20:00
Location:
MPIM Lecture Hall

Conference on

Arithmetic and Automorphic Forms

on the occasion of Günter Harder's 80th birthday

March 12 - 14, 2018

#### Scientific Committee

Werner Ballmann, Michael Rapoport, and Joachim Schwermer

#### Local Organizer

Werner Ballmann and Christian Blohmann

#### Speakers

Kai Behrend (U British Columbia)
Spencer Bloch (U Chicago)
Gaetan Chenevier (U Paris-Sud, Orsay)
Mark Goresky (IAS Princeton)
Tasho Kaletha (U Michigan)
Stephen S. Kudla (U Toronto)
Richard Pink (ETH Zürich)
Anantharam Raghuram (IISER Pune)
Andrei Rapinchuk (U Virginia)
Peter Scholze (U Bonn)
Carlos Simpson (U Nice)
Gerard van der Geer (U Amsterdam)

## Conference "Dynamics: Topology and Numbers", July 2 - 6, 2018

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Organiser(s):
M. Möller, P. Moree, A. Pohl, T. Ward
Date:
Mon, 2018-07-02 08:30 - Fri, 2018-07-06 18:00
Location:
MPIM Lecture Hall

Conference "Dynamics: Topology and Numbers"

July 2 - 6, 2018

## Conference "Higher algebra and mathematical physics", August 13 - 17, 2018

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Organiser(s):
D. Ayala, L. Brantner, K. Costello, O. Gwilliam, A. Henriques, T. Johnson-Freyd, A. Mazel-Gee, P. Teichner
Date:
Mon, 2018-08-13 08:30 - Fri, 2018-08-17 21:00
Location:
MPIM Lecture Hall

Double conference "Higher algebra and mathematical physics"

August 13 - 17, 2018

## Upcoming Talks

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

## Rational homology cobordisms of plumbed manifolds and arborescent link concordance

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Speaker:
Paolo Aceto
Affiliation:
Alfréd Rényi Institute of Mathematics, Budapest/MPIM
Date:
Mon, 2018-02-26 16:30 - 18:00
Location:
MPIM Lecture Hall
Parent event:
MPIM Topology Seminar

We investigate rational homology cobordisms of 3-manifolds with non-zero first Betti number.
This is motivated by the natural generalization of the slice-ribbon conjecture to multicomponent links.

We introduce a systematic way of constructing rational homology cobordisms between plumbed 3-manifolds and concordances between arborescent links.

We then describe a sliceness obstruction based on Donaldson's diagonalization theorem that leads to a proof of the slice-ribbon conjecture for 2-component Montesinos' links up to mutation.

## Quadratic Relations in Feynman Categories

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Speaker:
Ralph Kaufmann
Affiliation:
Purdue University, West Lafayette
Date:
Tue, 2018-02-27 14:00 - 15:00
Location:
MPIM Lecture Hall

I will start with a brief introduction to Feynman categories, and then explore the consequences of
quadratic relations for the morphisms in Feynman categories.

In the first part of the talk, I show how this leads to cubical complexes and prove that in this
way both the complex for moduli spaces of curves and the cubical complexes for Cutkosky rules
and calculations for Outer space arise naturally from push-forwards.

## tba

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Speaker:
Hélène Esnault
Affiliation:
FU Berlin
Date:
Wed, 2018-02-28 14:30 - 15:30
Location:
MPIM Lecture Hall

## On Sequences of Integers of Quadratic Fields and Relations with Artin’s Primitive Root Conjecture

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Speaker:
Nihal Bircan
Affiliation:
Çankırı Karatekin University
Date:
Wed, 2018-02-28 16:30 - 17:30
Location:
MPIM Lecture Hall
Parent event:
Number theory lunch seminar

I will consider the integers $\alpha$ of the quadratic field $\mathbb{Q} (\sqrt[]{d})$ with $d$ is a square-free integer.  Using the embedding into $\text{GL}(2,\mathbb{R})$ we obtain bounds for the smallest positive integer  $\nu$ such that $\alpha^\nu\equiv 1\bmod p.$ More generally, if $\mathcal{O}_{f}$ is a number ring of conductor $f$, we study the first integer $n=n(f)$ such that $\alpha^n\in\mathcal{O}_{f}$. We obtain bounds for $n(f)$ and for $n(fp^{k})$.

## Doubling Properties of Solutions to Elliptic PDE

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Speaker:
Bogdan Georgiev
Affiliation:
MPIM
Date:
Wed, 2018-02-28 16:30 - 18:00
Location:
MPIM Seminar Room
Parent event:
IMPRS seminar

## New guests at the MPIM

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Speaker:
Boulos El Hilany, Thierry Stulemeijer, Asilya Suleymanova
Date:
Thu, 2018-03-01 15:00 - 16:00
Location:
MPIM Lecture Hall
Parent event:
MPI-Oberseminar

## Representation theory learning seminar

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Organiser(s):
Emily Norton
Date:
Fri, 2018-03-02 14:15 - 16:30

## The Hilbert scheme of points of affine 3-space

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Speaker:
Andrea Ricolfi
Affiliation:
University of Stavanger/MPIM
Date:
Fri, 2018-03-02 14:15 - 16:30
Location:
MPIM Lecture Hall

We describe the scheme structure of the Hilbert scheme of points of affine 3-space,
in terms of representations of the Jacobi algebra of a quiver with potential. This exhibits the Hilbert scheme of points as the critical locus of a regular function on a smooth variety.
We discuss the torus action on the Hilbert scheme and its Euler characteristic.

## Hecke's integral formula and Kronecker's limit formula for an arbitrary extension of number fields

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Speaker:
Hohto Bekki
Affiliation:
MPIM
Date:
Wed, 2018-03-07 14:30 - 15:30
Location:
MPIM Lecture Hall

The classical Hecke's integral formula expresses the partial zeta function of real quadratic fields as an integral of the real analytic Eisenstein series along a certain closed geodesic on the modular curve. In this talk, we present a generalization of this formula in the case of an arbitrary extension E/F of number fields. As an application, we present the residue formula and Kronecker's limit formula for an extension E/F of number fields, which gives an integral expression of the residue and the constant term at s=1 of therelative'' partial zeta function associated to E/F.

## On the periodicity of geodesic continued fractions

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Speaker:
Hohto Bekki
Affiliation:
MPIM
Date:
Wed, 2018-03-07 16:30 - 17:30
Location:
MPIM Lecture Hall
Parent event:
Number theory lunch seminar

In this talk, we present some generalizations of Lagrange's periodicity theorem in the classical theory of continued fractions. The main idea is to use a geometric interpretation of the classical theory in terms of closed geodesics on the modular curve. As a result, for an extension F/F' of number fields with rank one relative unit group, we construct a geodesic multi-dimensional continued fraction algorithm toexpand'' a basis of F over the rationals, and prove its periodicity. Furthermore, we show that the periods describe the relative unit group.

## Mathematical events in Bonn

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##### 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

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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

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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

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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.

## Number theory lunch seminar

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Organiser(s):
P. Moree
Location:
MPIM Lecture Hall

The number theory lunch seminar takes place every Wednesday after a joint lunch of MPIM's number theorists...

## Topics in Topology

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Location:
MPIM Lecture Hall

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Organiser(s):
C. Kaiser

## Extra talk

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This is a collection of extra talks that don't fit into the other series.

## Seminar on Algebra, Geometry and Physics

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Organiser(s):
Yuri Manin
Date:
Fri, 2010-01-01 14:00 - Tue, 2024-12-31 15:00
Location:
MPIM Lecture Hall

## Seminar Algebraic Geometry (SAG)

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Organiser(s):
D. Huybrechts
Date:
Thu, 2011-01-06 10:30 - Thu, 2026-12-31 12:00
Location:
MPIM Lecture Hall

## Higher Differential Geometry Seminar

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Organiser(s):
Christian Blohmann
Date:
Wed, 2012-04-18 10:30 - Fri, 2021-04-30 12:00
Location:
MPIM Lecture Hall

## Archived Events

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

## MPI-Oberseminar

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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.

## Friedrich Hirzebruch Lecture

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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.

## Conference on "Elementare und Analytische Zahlentheorie (ELAZ)", September 3 - 7, 2018

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Date:
Mon, 2018-09-03 08:30 - Fri, 2018-09-07 18:00
Location:
MPIM Lecture Hall

Conference on "Elementare und Analytische Zahlentheorie (ELAZ)"

September 3 - 7,  2018

### Organizers

Kathrin Bringmann (Universität zu Köln)
Stephan Ehlen (Universität zu Köln)
Pieter Moree (MPIM Bonn)

## Conference "Higher algebra and mathematical physics", August 13 - 17, 2018

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Organiser(s):
D. Ayala, L. Brantner, K. Costello, O. Gwilliam, A. Henriques, T. Johnson-Freyd, A. Mazel-Gee, P. Teichner
Date:
Mon, 2018-08-13 08:30 - Fri, 2018-08-17 21:00
Location:
MPIM Lecture Hall

Double conference "Higher algebra and mathematical physics"

August 13 - 17, 2018

## Conference "Dynamics: Topology and Numbers", July 2 - 6, 2018

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Organiser(s):
M. Möller, P. Moree, A. Pohl, T. Ward
Date:
Mon, 2018-07-02 08:30 - Fri, 2018-07-06 18:00
Location:
MPIM Lecture Hall

Conference "Dynamics: Topology and Numbers"

July 2 - 6, 2018

## Higher structures, quantum groups, and genus zero modular operad. Part 2

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Speaker:
Yuri Manin
Affiliation:
MPIM
Date:
Wed, 2018-05-16 10:30 - 12:00
Location:
MPIM Lecture Hall

## Higher structures, quantum groups, and genus zero modular operad. Part 1

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Speaker:
Yuri Manin
Affiliation:
MPIM
Date:
Wed, 2018-05-09 10:30 - 12:00
Location:
MPIM Lecture Hall

## What is the category of representations of classical Lie algebras of "infinite rank"?

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Speaker:
Ivan Penkov
Affiliation:
Jacobs University, Bremen
Date:
Tue, 2018-05-08 14:00 - 15:00
Location:
MPIM Lecture Hall

The classical Lie algebras sl, so, sp "of infinite rank" in the naive sense have   uncountably many nonconjugate Borel subalgebras. Therefore the definition of categories of their representations involves choices. A natural choice is a Dynkin Borel subalgebra. In this talk, I will advocate for another choice, namely that of a perfect Borel subalgebra. In addition, I will impose the condition of  large local annihilator on the objects of the category. The resulting category is a nice highest-weight category  with standard objects, but without costandard objects.

## tba

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Speaker:
Qiyu Chen
Affiliation:
Sun Yat-sen University/ MPIM
Date:
Thu, 2018-05-03 16:30 - 17:30
Location:
MPIM Lecture Hall

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Speaker:
Matias del Hoyo
Affiliation: