NSeaG2023 Workshop: Noncommutative Geometry and Operator Algebras

Date:  May 8 – May 12, 2023

Venue: Lecture hall HIM, Poppelsdorfer Allee 45

Organizers: Francesca Arici (Leiden University), Joakim Arnlind (Linköping University), Sven Raum (Stockholm University/University of Potsdam), Koen van den Dungen (University of Bonn)

Confirmed Speakers:

  • Sara Azzali (University of Bari Aldo Moro)
  • Kenny de Commer (Vrije Universiteit Brussel)
  • Anna Duwenig (KU Leuven)
  • Jens Kaad (University of Southern Denmark)
  • David Kyed (University of Southern Denmark)
  • Nadia Larsen (University of Oslo)
  • Matthias Lesch (University of Bonn)
  • Wolfgang Lück (University of Bonn)
  • Shahn Majid (Queen Mary University of London)
  • Ralf Meyer (University of Göttingen)
  • Henri Moscovici (Ohio State University)
  • Sanaz Pooya (Stockholm University)
  • Alice Rizzardo (University of Liverpool)
  • Walter van Suijlekom (Radboud University Nijmegen)
  • Mike Whittaker (University of Glasgow)
  • Sophie Emma Zegers (Charles University in Prague)


The NSeaG2023 workshop continues the series NSeaG — Noncommutative Geometry along the North Sea — started in spring 2022 at the Lorentz Center. The workshop will provide a platform for the exchange of new ideas and discussion of recent developments for researchers in noncommutative geometry (NCG) and neighbouring topics. Its geographic focus on activities along the North Sea supports community building in this area.


The University of Bonn and HSM are committed to diversity and equal opportunity. We aim to increase the proportion of women in areas where women are underrepresented and to facilitate their careers. We therefore strongly encourage women with relevant qualifications to apply.

In case of scientific questions, please contact the organizers at kdungen@math.uni-bonn.de, in case of questions concerning services and administration, please contact hsm(at)hcm.uni-bonn.de.


Dear guests,

some of our guests are currently receiving phishing messages from scam travel companies such as travellerpoint(dot)org asking about travel details. Unfortunately, there is very little we can do to prevent this. Please, do not share any personal, or payment data with persons contacting you from emails that you cannot identify as belonging to the organizers at the University of Bonn or the Hausdorff Center for Mathematics. And feel free to reach out, if you are unsure!




This workshop is part of the NSeaG2023 meeting, and is preceded by the following Hausdorff School, which will take place the week before.
Hausdorff School: Noncommutative Geometry and Operator Algebras (May 2- May 5,2023)

Noncommutative Geometry (NCG) is a broad area of mathematics connected to a variety of topics, which can be a challenging situation for early career researchers in the field. This Hausdorff School (part of the NSeaG2023 meeting in Bonn) will address this need and introduce participants to a selection of active research topics through mini-courses, notably on unbounded KK-theory and spectral triples, the Baum—Connes conjecture, quantum groups, and quantum metric spaces. An in-depth introduction, leading up to state-of-the-art knowledge in these lines of research will be provided.

Monday, May 8

Shan Majid: Dirac operators built from quantum Riemannian geometries

M Ali Asadi Vasif: The Cuntz semigroups of the crossed products

Ralf Meyer: Groupoid models for groupoid correspondences and C*-algebras

Wolfgang Lück

Tuesday, May 9

Sanaz Pooya: On higher Kazhdan projections and their K-theory classes

Sophie Emma Zegers: Equivariant Isomorphism of Quantum Lens Spaces

Mario Klisse: Crossed products as compact quantum metric spaces

Manish Kumar: Factoriality of q-Araki-Woods von Neumann Algebras

Kenny de Commer: Equivariant correspondences

Wednesday, May 10

Walter van Suijlekom: Noncommutative spaces at finite resolution

Henri Moscovici: Prolate Dirac operators and the zeros of Zeta

Malte Leimbach: Spectral truncations of low-dimensional tori

Dimitris Gerontogiannis: The logarithmic Dirichlet Laplacian on Ahlfors regular spaces

Thursday, May 11

Anna Duwenig: The Zappa-Szép product of a Fell bundle and a groupoid

Marzieh Forough: Lifts of completely positive maps

Mahsa Naraghi

Alexander Angus: An index pairing in scattering theory

Jens Kaad: External products of spectral metric spaces

Friday, May 12

David Kyed: Finiteness of metrics on state spaces

Matthias Lesch: Rearrangement Lemma, Divided Differences, and Multivariate Holomorphic Functional Calculus