## Upcoming conferences & activities

## 3rd Japanese-German Number Theory Workshop, November 20 - 24, 2017

**3rd Japanese-German Number Theory Workshop**

**November 20 - 24, 2017**

Here you can find the official homepage

#### Organizers

- German Organizers : Jonas Kaszian (University of Cologne), Pieter Moree (MPIM)
- Japanese Organaizers : Hiroki Aoki (Tokyo University of Science), Koji Tasaka (MPIM/Aichi Prefectural University)

#### Speakers

Sho Takemori (MPIM)

Tomomi Ozawa (Univ. Paris 13)

Kenji Makiyama (Kyoto Sangyo Univ.)

Ren-he Su (Kyoto Univ.)

Nobuo Sato (Kyoto Univ.)

Hiraku Atobe (Tokyo Univ.)

Shingo Sugiyama (Kyushu Univ.)

Minoru Hirose (Kyushu Univ.)

Toshiki Matsusaka (Kyushu Univ.)

Shun'ichi Yokoyama (Kyushu Univ.)

Hiroshi Sakata (Waseda Univ Senior High School)

Hidetaka Kitayama (Wakayama Univ.)

Hiro-aki Narita (Kumamoto Univ.)

Takashi Nakamura (Tokyo Univ. of Science)

Hiroki Aoki (Tokyo Univ. of Science)

Claudia Alfes-Neumann (University of Cologne)

Jan Bruinier (TU Darmstadt)

Steffen Löbrich (University of Cologne)

Markus Schwagenscheidt (TU Darmstadt)

Annalena Wernz (RWTH Aachen)

## Workshop "Young Researchers in String Mathematics", November 27 - 30, 2017

**Workshop "Young Researchers in String Mathematics"**

**November 27 - 30, 2017**

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

**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

**Conference "Dynamics: Topology and Numbers"**

**July 2 - 6, 2018 **

## Upcoming Talks

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

## Seminar on Kac-Moody algebras and related topics

## On a certain class of linear relations among the multiple zeta values arising from the theory of iterated integrals

In this talk, we consider iterated integrals on a projective line minus generic four points and introduce a new class of linear relations among the MZVs, which we call confluent relations. We start with Goncharov’s notation for iterated integrals, review some basic notions and properties of iterated integrals, and define a class of relations among iterated integrals, which naturally arise as “solving differential equations step by step”. Confluent relations are defined as the limit of these relations when merging two out of the four punctured points.

## 4d TFTs, Categorical bialgebras, and 2-Segal spaces

In the 90s Crane-Frenkel proprosed the construction of a 4d TQFT from a bimonoidal category, that is, a category equipped with both a monoidal and comonoidal structure so that the data defining the comonoidal structure is itself monoidal. In this talk I will explain a conceptual reason for the connection between bialgebras and TFTs. Secondly, I will describe how to extend the classical construction of the Hall algebra of an abelian category to produce new examples of bimonoidal categories: the Hall bimonoidal categories.

## On linear relations between L-values and arithmetic functions

In 1975 Cohen constructed a series of modular forms of half-integral weights. Its q-coefficients contain special values of Dirichlet functions and were used by Cohen to create various equations of them with arithmetic functions. The modular forms are called Cohen-Eisenstein series and were later generalized to the case for Hilbert modular forms.

## On a mean value result for a product of $L$-functions

The asymptotic behaviour of moments of $L$-functions is of special interest to number theorists and there are conjectures that predict the shape of the moments for families of $L$-functions of a given symmetry type. However, only some results for the first few moments are known. In this talk we will consider the asymptotic behaviour of the first moment of the product of a Hecke $L$-function and a symmetric square L-function. This is joint work with O. Balkanova, G. Bhowmik, D. Frolenkov.

## On the structure of mixed weight Hilbert modular forms

In this talk we discuss joint work with Sho Takemori on Hilbert modular forms

over the real quadratic field of discriminant 5, with respect to its full modular group.

The graded ring of all Hilbert modular forms of parallel weight were determined by Gundlach.

By using his result and some elementary technique, we establish a structure theorem on mixed

Hilbert modular forms.

## Computing weight 1 forms -- a p-adic approach

The computation of Hecke-eigenforms of weight at least 2 is readily accomplished through the

theory of modular symbols as these Hecke-eigensystems occur in the cohomology of modular

curves. However, the same is not true for weight 1 modular forms which makes computing

the dimensions of such spaces difficult let alone the actual system of Hecke-eigenvalues.

Recently effective methods for computing such spaces have been introduced building on an

algorithm of Kevin Buzzard. In this talk, we present a different, p-adic approach towards

## Algebra up to homotopy

## A p-adic family of Saito-Kurokawa lifts for a Coleman family and the Bloch-Kato conjecture

We will construct a $p$-adic family of Saito-Kurokawa lifts for a Coleman family and extend the result of Agarwal and Brown on the Bloch-Kato conjecture for elliptic modular forms of low weights to higher weights. More precisely, we will prove that the $p$-valuation of the order of the Selmer group of a Coleman deformation is bounded below by the $p$-valuation of the algebraic part of the critical $L$-value attached to the initial Hecke eigenform of a Coleman family satisfying some reasonable assumptions given by Agarwal and Brown.

## Motivic obstruction to rationality of a very general cubic hypersurface in P^5

## 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.

## Number theory lunch seminar

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

## IMPRS Minicourse

## Extra talk

## Seminar on Algebra, Geometry and Physics

## Seminar Algebraic Geometry (SAG)

## Higher Differential Geometry Seminar

## 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.

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

**Conference "Dynamics: Topology and Numbers"**

**July 2 - 6, 2018 **

## ERCOM: European Research Centres on Mathematics, April 27 -28, 2018

## Registration **Agenda Accommodation Contact/Location**

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

**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)