Activities

www.uni-giessen.de/mathematik-airportseminar

The thematic focus of the conference series is on geometric, analytic and ergodic theoretical aspects of groups and their actions, but the conferences aim to explore also related areas of mathematics from representation theory and harmonic analysis over differential and metric geometry to topology, algebraic geometry and model theory, as well as to set a spotlight on newly emerging areas.

Start: Monday, 16/03/2020 02:00 pm
End: Tuesday, 17/03/2020 05:00 pm

This is the second meeting in a series of seminars on Geometric Analysis jointly organized by the Universities of Freiburg, Heidelberg, Stuttgart and Tübingen. It is intended to be a regular meeting of researchers from the South-West with an interest in the fields of geometry and analysis.

Start: Friday, 24/01/2020 01:00 pm
End: Friday, 24/01/2020 06:00 pm
Related project(s):
03Geometric operators on a class of manifolds with bounded geometry32Asymptotic geometry of the Higgs bundle moduli space

Mathematical general relativity is based on the theory of wave equations on curved spaces. In fact, even the gravitational field itself satisfies a non-linear wave equation, known as Einstein’s equation. Einstein’s equation is, in general, very difficult to solve and one therefore studies the wave equations on special models of the universe. The most simple model is the Minkowski space, which is the model of the universe in special relativity. This model is, however, not “expanding” and therefore not a good model for our universe (which is known to expand). The second most simple model for the universe is the so-called de Sitter space, which is believed to be a more accurate, since it is expanding. Fortunately, it is much easier to predict (estimate) solutions to wave equations on de Sitter space, than on Minkowski space. Moreover, there are natural generalizations of the de Sitter space including models for black holes. One of the most remarkable recent results in mathematical general relativity is the proof that such blackhole models are stable, by work of Hintz and Vasy [HV18].

In this winter school, we study wave equations on de Sitter space and the generalizations, including black holes. Though the proof of stability, mentioned above, lies beyond the scope of this winter school, the topics we will discuss are the natural first steps in this direction. We mainly will focus on a paper by Vasy [Vas10], where linear wave equations on asymptotically de Sitter spaces (generalizing de Sitter space) are studied in detail. Many of the non-technical ideas and basic structures in [HV18 ]are already present in [Vas10]. Vasy uses a microlocal analysis point of view,which gives a modern treatment of a classical problem. The methods include the construction and analysis of so-called Fourier integral operators (generalizing pseudo-differential operators), which will be studied in detail. From the time when the paper [Vas10] was published, a sequence of papers including [Vas13], [MSBV14], and [HV15], was published, building up for the final stability result in [HV18]. Even though most of the focus will be on [Vas10], the winter school will include a brief overview of all these papers and in particular an outline of the approach towards [HV18].

Start: Wednesday, 15/01/2020 01:30 am
End: Friday, 17/01/2020 05:00 pm
Related project(s):
21Stability and instability of Einstein manifolds with prescribed asymptotic geometry

This is the sixth instance of the Bavarian Geometry & Topology Meeting, which brings together researchers from Bavaria with international experts.

Start: Thursday, 05/12/2019 10:00 am
End: Friday, 06/12/2019 05:00 pm
Related project(s):
15Spaces and Moduli Spaces of Riemannian Metrics with Curvature Bounds on compact and non-compact Manifolds

The Buildings conference is a conference series in its 26th year whith a focus on the geometry of spaces of non-positive curvature and in particular the geometry of and group actions on buildings.

Other topics represented in the conference are Kac-Moody geometry, non-compact type symmetric spaces, Coxeter groups, Artin groups (including braid groups) and lattices in locally compact groups. The conference aims in particular at young researchers in the area and fosters collaboration between researchers in closely related fields.

Start: Monday, 30/09/2019 09:00 am
End: Wednesday, 02/10/2019 12:30 pm
Related project(s):
20Compactifications and Local-to-Global Structure for Bruhat-Tits Buildings

General Relativity is a beautiful physical theory which has successfully predicted many natural phenomena such as black holes and gravitational waves. Since Yvonne Choquet-Bruhat’s seminal work in the 1960’s, it has attracted the attention of mathematicians whose attention is caught by the fascinating interactions between the differential geometric setting of the theory, the partial differential Einstein equations describing the behavior of gravitational systems, and the intimate connections with mathematical and theoretical physics.

The aim of the minisymposium is to discuss recent progress in this very active subfield of geometric analysis in a way that is also inviting for young and experienced researchers from neighboring disciplines.

Start: Tuesday, 24/09/2019 10:00 am
End: Tuesday, 24/09/2019 06:00 pm
Related project(s):
05Index theory on Lorentzian manifolds

An international conference to bring together experts in various fields working on the general scheme of approximation of infinite geometric or algebraic structures by finitary objects. Cases of this general approach appear in Ramsey theory, coarse geometry, geometric group theory, the theory of operator algebras and ergodic theory.

Start: Monday, 05/08/2019 09:30 am
End: Saturday, 10/08/2019 05:30 pm
Related project(s):
02Asymptotic geometry of sofic groups and manifolds

The purpose of the meeting is to study relationships between local and global invariants in Riemannian Geometry. Our intention is to bring together experts in the field as well as young mathematicians.

Start: Monday, 29/07/2019 09:00 am
End: Friday, 02/08/2019 06:00 pm
Related project(s):
11Topological and equivariant rigidity in the presence of lower curvature bounds15Spaces and Moduli Spaces of Riemannian Metrics with Curvature Bounds on compact and non-compact Manifolds

The workshop brings together senior researchers, postdocs and graduate students who are working on bounded cohomology and related fields. For more information, see the webpage at www.mathi.uni-heidelberg.de/~aott/bc19.html.

Start: Monday, 29/07/2019 09:00 am
End: Friday, 02/08/2019 06:00 pm
Related project(s):
27Invariants and boundaries of spaces

This workshop is intended as the continuation of a series of highly successful international conferences centered around the analysis and geometry of gauge-theoretically defined moduli spaces.

Gauge-theoretically defined moduli spaces often exhibit interesting geometry at infinity. In many interesting cases they are non-compact, carry special metrics (often hyperkähler) and limit to certain asymptotic models. Their description requires tools from geometry and global analysis.

We intend to bring together a number of internationally renowned experts as well as younger researchers in the field.

Start: Monday, 22/07/2019 09:30 am
End: Friday, 26/07/2019 01:00 pm
Related project(s):
07Asymptotic geometry of moduli spaces of curves13Analysis on spaces with fibred cusps32Asymptotic geometry of the Higgs bundle moduli space