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 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)

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

**Workshop on Young Researchers in String Mathematics**

**November 27 - 30, 2017**

The workshop is an occasion to foster interactions and initiate new collaborations between young researchers active in Germany and nearby countries, who are all interested in mathematical aspects of string theory: mirror symmetry, enumerative geometry of curves (Gromov-Witten theory, Donaldson-Thomas, stable pair invariants, ...) and their modularity, integrability, and algebraic properties, tropical geometry, topological recursion, wall-crossing phenomena and Bridgeland stability conditions, relations to gauge theory, geometric quantization, conformal field theory, etc.

#### Organizers

Murad Alim (Universität Hamburg) and Gaëtan Borot (MPIM)

#### Speakers

Murad Alim (Universität Hamburg)

Gaëtan Borot (MPIM)

Andrea Brini* (CNRS Montpellier/Imperial College)

Miranda Cheng (University of Amsterdam)

Sara Angela Filippini (Cambridge University)

Michel van Garrel (Universität Hamburg)

Owen Gwilliam (MPIM)

Lotte Hollands (Heriot-Watt University, Edimburgh)

Victoria Hoskins (Humboldt Universität, Berlin)

Hans Jockers (Universität Bonn)

Christian Lehn (Universität Chemnitz)

Jan Manschot (Trinity College Dublin)

Elli Pomoni (DESY Hamburg)

Johannes Rau (Universität Tübingen)

Thomas Reichelt (Universität Heidelberg)

Helge Ruddat (Universität Mainz)

Sarah Scherotzke (Bristol University)

Maxim Smirnov (Universität Augsburg/MPIM)

Piotr Sułkowski (University of Warsaw)

Di Yang (MPIM)

* = to be confirmed

## "Descartes, Euler, Gauss: From surfaces to integers". Hirzebruch lecture by Werner Ballmann on Monday, November 13

Geometric quantities of a surface, like distance, angle, or area, change when the surface is deformed. Euler discovered a quantity, the Euler characteristic, which remains unchanged. The formula of Gauss-Bonnet, a landmark result of mathematics, relates Euler characteristic with geometry. In the talk, I will present ideas of Descartes, Euler, and Gauss related to this formula.

## Hirzebruch Colloqium

15:00-16:00

tba

tba

16:00-16:30

Special tea

16:30-17:30

tba

tba

## Clone of Non-commutative transport metrics, gradient flow and functional inequalities

tba.

## tba.

tba.

## Kurdyka-Lojasiewicz-Simon inequality for gradient flows in metric spaces

In this talk, I will present new tools and methods in the study of the trend to equilibrium of gradient flows in metric spaces $(\mathcal{M},d)$ in the *entropy* and *metric* sense, to establish *decay rates*, finite time of extinction, and to characterise *Lyapunov stable equilibrium points*. More precisely,

## Discrete versions of the Li-Yau gradient estimate

In the celebrated paper [2], Li and Yau proved the parabolic Harnack inequality for Riemannian manifolds with Ricci curvature bounded from below. The key step in their proof was a completely new type of Harnack estimate, namely a pointwise gradient estimate, called {\em differential Harnack inequality}, which, by integration along a path, yields the classical parabolic Harnack estimate. If one tries to apply this method to discrete structures (graphs) one is faced with two big obstacles.