Geometry and Quantum Theory (GQT)


1 January 2016

Events 2016

Higher geometric structures along the Lower Rhine IX, May 11-12, RU Nijmegen
May 11th, 2017

We would like to announce the ninth workshop of the series on “Higher Geometric Structures along the Lower Rhine”, jointly organized by geometers and topologists from Bonn, Nijmegen, and Utrecht.
The meeting will be held at Radboud University Nijmegen, on May 11-12, 2017.

The focus of this workshop series 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 field theories, higher categories, homotopy algebraic structures, higher operads, derived categories, and related topics.

The speakers are:
Francesca Arici
Michael Bailey
Tyrone Crisp
Honglei Lang
Milena Pabiniak
Markus Pflaum

For the registration and more information please check site.

Topology/geometry seminar: Ezra Getzler will give a talk on The derived Maurer-Cartan locus
March 14th, 2017

Abstract: This talk is based on a recent paper in l’Enseignement Mathématique of this title. There are two models for derived schemes: differential graded manifolds and cosimplicial manifolds. The cosimplicial formalism is more general: in this talk, I construct a functor from differential graded Lie algebras to cosimplicial manifolds which represents the derived Maurer-Cartan locus. The talk will be a very gentle introduction to this subject: some background in the theory of simplicial and cosimplicial abelian groups is useful but not required.

As always, all interested are welcome.
Ieke Moerdijk

Workshop on generalized geometry
November 30th, 2016

We are organizing a mini workshop on the occasion of Joey van der Leer Duran’s graduation. The meeting will take place in the Sonnenborgh Observatorium on the 30th of November. The speakers will be Gueo Grantcharov, Ioan Marcut and Brent Pym.

Registration is free and people attending the workshop will be provided with coffee and lunch. To help us with the planning, please register if you intend to come.

GQT school and colloquium
November 28th, 2016 

Will take place in Ernst Sillem Hoeve Hotel and Conference Center form the 28th of November to the 2nd of December.

School lectures will be:
Martijn Kool — Toric varieties and equivariant vector bundles
Suijlekom & Arici — Noncommutative geometry and gauge theories
Gerard van der Geer — Modular forms
See the event webpage for registration and further details.

Workshop: The Big Picture (on the occasion of Jan Stienstra’s retirement)
November 25th, 2016

Date: Friday November 25, 2016 (10.30-17.30).
Raf Bocklandt (UvA)
Vasily Golyshev (Moscow)
Anton Mellit (Trieste)
Duco van Straten (Mainz)

Participation in this symposium is open and free to all interested, but registration is required. Please register by sending an email to as soon as possible. Mention in this email “JS65”. Lunch (Yes or No; Also, if you have special dietary requirements, please let us know). For more information click on the link above.

Mini-workshop on symplectic geometry
September 30th, 2016
On September 30 we will organize a mini-workshop on symplectic geometry at the VU Amsterdam. It is aimed at researchers, Ph.D. students, and advanced master’s students working in symplectic geometry and related areas. The speakers are:

Hansjörg Geiges (Universität zu Köln)
Urs Frauenfelder (Universität Augsburg)
Alexander Ritter (University of Oxford)
Lev Buhovski (Tel Aviv University)

* If you are interested in participating then please register.

Please indicate if you will join us for dinner.
Oliver Fabert (VU Amsterdam)
Fabian Ziltener (Universiteit Utrecht)

GQT School and Colloquium
June 6th, 2016

The next GQT school and colloquium will take place in Woudschoten Hotel and Conference Center form the 6th to 10th of June. School lectures will be:

Ioan Marcut — Dirac Structures

Gert Heckman — Complex reflexion groups

Nicolai Reshetikhin — BV-quantization

See the event webpage for registration and further details.

2nd Kan memorial lectures
June 2nd, 2016

We are honoured that Graeme Segal (Oxford) will give the 2nd Kan Memorial Lectures at Utrecht University.
The lectures start with a colloquium style talk on 2 June, in the Atlas Lecture Theater, Koningsberger building

The Ubiquity of Homotopy, 15.30-16.30

Refreshments beforehand from 15.00-15.30
Drinks afterwards from 16.30-17.00 in the mathematics library

Two more specialised lectures will follow on
Friday 3 June, in The Hans Freudenthal building, room 611
Aspects of non-commutative geometry, 11.00-12.00
Higher structures in homotopy theory, 15.00-16.00

Much of mathematics is about discovering robust kinds of structure which organize and illuminate large areas of the subject. Perhaps the most basic organizing concept of our thought is space. It leads us to the homotopy category, which captures many of our geometric intuitions but also arises unexpectedly in contexts far from ordinary spaces. Still more is this true of the `stable homotopy’ category, which sits midway between geometry and algebra.
The theme of my lectures is the strangeness and the ubiquity of the homotopy and stable homotopy categories, and how they give us new ideas of what a space is, and why manifolds and spaces with algebraic structure play such a special role. The first lecture will be a non-technical survey of things discussed in more detail in the following two, such as the dual ways of thinking of a space in terms of the paths in it and in terms of its algebra of functions; also, what abstract homotopy theory is, and how it leads us to new geometrical ideas and new analogues of the stable homotopy category.
One of the biggest steps in disengaging homotopy from spaces was Kan’s theory of simplicial objects; a subtheme is the different ways in which this can be viewed and the different directions in which it can lead.
The second lecture focuses on the relation between spaces and their algebras of functions, algebraic K-theory, and the nature of noncommutative spaces and `quantization’ – what it means for a noncommutative object to be a deformation of a normal space. We see how the stable homotopy category sits inside a noncommutative stable category. I shall speculate on the place of Floer homotopy theory in this picture.
The third lecture is partly about how manifolds relate to stable homotopy, and the role of Poincare duality and quadratic forms. It is also about the `higher homotopies’ which lie below the surface of the naive homotopy category. This is another angle on the interpolation between commutativity and noncommutativity, more from the perspective of traditional algebraic topology.

Topics in the Langlands Correspondence
June 2nd, 2016

Workshop on June 2nd and 3rd at the University of Amsterdam, Kortweg de Vries Institute on the occasion of the Ph.D. defense of Marcelo G. De Martino

Location SP 107, room F3.20
Thursday 02/06
15:00-16:00: Gordan Savin (University of Utah)
16:15-17:15: Erik van den Ban (Universiteit Utrecht)

Friday 03/06
10:00-11:00: Dipendra Prasad (Tata Inst. of Fund. Research)
11:15-12:15: Anne-Marie Aubert (Inst. Mathématiques de Jussieu)

Gordan Savin: TBA
Erik van den Ban: TBA

Dipendra Prasad: A relative Local Langlands correspondence.
Abstract: For E/F quadratic extension of local fields, we consider the question of classifying irreducible admissible representations of G(E) which carry a G(F)-inv. linear form. Although in a certain generic sense, one expects a simple answer – multiplicity 1, and exact characterization, the full answer is rather complicated – and interesting, involving geometry of Langlands parameters.

Anne-Marie Aubert: Cuspidality and Hecke algebras for enhanced Langlands parameters
Abstract: Enhanced Langlands parameters for a p-adic group G are pairs formed by a Langlands parameter for G and an irreducible character of a certain component group attached to the parameter. We will introduce a notion of cuspidality for these pairs, describe a construction of a cuspidal support map for enhanced Langlands parameters, and attach an almost affine Hecke algebra to every cuspidal support. It is joint work with Ahmed Moussaoui and Maarten Solleveld.

Belgian-Dutch Algebraic Geometry Day
April 22nd, 2016
Friday April 22 in Leuven: 10th edition of the Belgian-Dutch Algebraic Geometry Days. Speakers: Sho Tanimoto (Copenhagen), John Christian Ottem (Oslo), Bruno Chiarellotto (Padova).

Gauge Theory and Noncommutative Geometry
April 4th, 2016

4-8 April 2016 at the Radboud University Nijmegen.
More details can be found here

If you’re interested in coming, please let us know by filling in the registration form.

Organizing committee
Simon Brain
Klaas Landsman
Walter van Suijlekom

Mini-Workshop on Symplectic Geometry
March 11th, 2016

This mini-workshop is aimed at researchers, Ph.D. students, and advanced master’s students working in symplectic geometry and related areas. It is organized jointly with the Vrije Universiteit Amsterdam.

This is the third workshop that we are organizing. These mini-workshops take place biannually. The goal is to strengthen the symplectic community of the Netherlands and to connect it with abroad. Topics include Hamiltonian dynamics, the symplectic embedding question, holomorphic curves, and Floer homology.


Claude Viterbo (ENS Paris)
Janko Latschev (Universität Hamburg)
Yaron Ostrover (Tel Aviv University)
Chris Wendl (University College London)


Oliver Fabert (Vrije Universiteit Amsterdam)
Fabian Ziltener (Universiteit Utrecht)

Please registerby March 3!

For any question please contact Oliver Fabert at and Fabian Ziltener at .

Winter school: Banach methods in noncommutative geometry
January 25th, 2016

From 25th-29th January, 2016 we have organized a winter school in Münster entitled Banach methods in noncommutative geometry: isomorphism conjectures and geometry of groups. The school is aimed at PhD students and postdocs as well as M.Sc. students continuing in academia. We will focus on the connection between Banach/operator space methods as approximation properties and geometric properties of groups and their connection to problems as the Baum-Connes and conjecture. We welcome young researchers in these, and neighbouring areas to participate.

Lectures are given by:
-Siegfried Echterhoff (Münster)
-Erik Guentner (Hawaii)
-Michael Puschnigg (Aix-Marseille)
-Mikael de la Salle (ENS Lyon)
-Guoliang Yu (Texas A&M)

Please register here

For information on funding we refer you to the website. The workshop has been organized together with the ANR SingStar project. Please feel free to forward the announcement to people who may be interested.

Organizer: Martijn Caspers, Maria-Paula Gomez, Pierre-Yves Le Gall, Walther Paravicini