Category Archives: Blog

Noncommutative Geometry and the Standard Model, Cracow

Mini-conference: “Noncommutative Geometry and the Standard
Model” in Cracow, at the Jagiellonian University on November 8-9th (Friday-Saturday), 2019.


The conference focuses on the recent develepments of the noncommutative approach to fundamental
particle interactions and gravity.

All further information is available at

Noncommutative Calculus and the Spectral Action


Monday, 5 August 2019 – 9:00am to Friday, 9 August 2019 – 5:00pm


Room 4082, Red Centre Building, Kensington Campus, UNSW Sydney

The purpose of this workshop is to link mathematicians working in operator theory and noncommutative calculus with mathematical physicists in the area of the spectral action principle.

The Spectral Action is a new and high profile theory that unites quantum and classical action principles in a mathematically elegant construction. Professor Walter van Suijlekom (the Institute for Mathematics, Astrophysics and Particle Physics of the Radboud University Nijmegen) will give a mini-lecture series on the spectral actions during the mornings of the workshop. Talks on the spectral action will be given by other international experts, including Professor Giovanni Landi and Professor Bruno Iochum. Specific mathematical topics are trace class aysmptotic expansions, noncommutative Taylor series expansions, Dixmier trace and higher order residues.

Conference “Quantum flag manifolds in Prague”

16-20 September 2019


Focusing on the noncommutative geometry of quantum groups and its interactions with noncommutative algebra geometry, spectral triples, and parabolic geometry


Réamonn Ó Buachalla, Université Libre de Bruxelles
Petr Somberg, Charles University in Prague
Jan Šťovíček, Charles University in Prague
Karen Strung, Radboud University Nijmegen

Symposium on Noncommutative Geometry, Nijmegen

Symposium on Noncommutative Geometry

Radboud University Nijmegen, April 11-12, 2019

Organizer: Walter van Suijlekom, Radboud University Nijmegen

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All Lectures will be held in HG03.085

Thursday April 11

12:00-14:00 Lunch
14:00-15:00 Ali Chamseddine (American University of Beirut, Lebanon/Radboud University Nijmegen) Volume quantization and instantons
15:00-15:30 Coffee/tea
15:30-16:30 Joseph Várilly (University of Costa Rica) Classical elementary systems for Wigner’s particles
16:30 Drinks
19:00 Dinner

Friday April 12

10:00-11:00 José M. Gracia-Bondía (University of Zaragoza) Why the electroweak sector of the Standard Model is chiral
11:00-12:00 Francesca Arici (Radboud University Nijmegen) Sphere bundles in noncommutative geometry
12:00-14:00 Lunch
14:00-15:00 Alessandro Carotenuto (SISSA, Trieste) Differential calculus for Jordan algebras and modules and the Standard model of particle physics
15:00-15:30 Coffee/tea
15:30-16:00 Bram Mesland (Radboud University Nijmegen) Untwisting twisted spectral triples
16:15 Drinks

Lecture series on “Noncommutative Geometry and Particle Physics” by Radboud Excellence Professor Chamseddine, Nijmegen

This is to announce a series of lectures delivered by Ali Chamseddine (American University of Beirut, Lebanon), who is visiting Radboud University Nijmegen this Spring as a Radboud Excellence Professor. All talks will take place in the Huygensgebouw (Science Faculty) of Radboud University Nijmegen.

The first lecture (on March 26, 2019, 15:30-16:30, HG00.622) will be intended for a broad audience (with some background/interest in physics), and will be on the noncommutative geometry underlying the Standard Model of Particle Physics. Afterwards there will be a reception.

In the second and third lecture (on April 2 and 9, 2019, 15:30-16:30 in HG00.622 and HG00.108, resp.) the formalism will be further laid out; these lectures will be more specialized. Below you find more detailed titles and abstracts.



The titles of the three lectures are:
1- Noncommutative Geometry and Particle Physics: Introduction (March 26, 2019, 15:30-16:30 in HG00.622, drinks afterwards)
2- Noncommutative Geometry and Particle Physics: Unification (April 2, 2019, 15:30-16:30 in HG00.622)
3- Mimetic Gravity and Dark Matter (April 9, 2019, 15:30-16:30 in HG00.108)

Abstract (Lecture 1)
The fundamental particles and their interactions are well represented by the the Standard Model of
Particle Physics and Einstein gravity. It is not known or understood the reasons why nature made this
choice for the particles and their representations. In this lecture, following down to top approach, I will
show that noncommutative geometry, as defined by Alain Connes, is the underlying geometry of space-time
and provides the answer to “Why the Standard Model”.

Abstract (Lecture 2)
Addressing the mathematical question of characterizing four-dimensional spin manifolds leads to a
relation similar to Heisenberg noncommutativity of coordinates and momenta in Quantum Mechanics.
I show that this relation implies the quantization of the volume of space-time and leads uniquely to
identify the underlying geometry, which turns out to be noncommutative. The resulting dynamical theory
unifies all interactions including gravity with the Standard Model the effective symmetry at low energies.

Abstract (Lecture 3)
Over the years many attempts were made to isolate the scale factor in General Relativity (known as
the dilaton) but these, however, proved not to be useful. A novel idea is presented where the scale
factor is isolated in a covariant way where it will be traded for a scalar field representing the time coordinate.
I will show that this innocent looking modification has drastic consequences on cosmology. In particular, geometric
invariants of the scalar field now mimic dark matter without the need for new interactions. These can also provide
mechanisms to avoid singularities for Friedman and Kasner cosmologies, as well as black hole singularities of
Schwarzschild like metrics.


Masterclass on Subfactors and Quantum Groups, Copenhagen

Subfactors and Quantum Groups: a combinatorial approach to some problems in Operator Algebras

Masterclass, University of Copenhagen, 29 April –  3 May 2019

The celebrated theory of subfactors studied by V. Jones in the early 1980’s finds a connection with discrete quantum groups (duals of compact quantum groups in the sense of Woronowicz) through the concept of rigid C*-tensor category thanks to works of S. Popa in the 1990’s. The aim of this 5-days masterclass is to provide a comprehensive introduction to the subfactor theory as well as the combinatorics behind in order to understand this connection and highlight some recent applications.

The masterclass will consist of three lecture series by Michael Brannan, Amaury Freslon and Stefaan Vaes, accompained by several problem sessions. Besides, there will be three contributed talks which will complement the topics treated in the mini-courses.

Position in Geometry at Radboud University

The Mathematics department of Radboud University (Nijmegen, The Netherlands) has a vacancy for a tenure track assistant/associate professorship in Geometry (broadly interpreted).

Initially this concerns an employment for six years. There will be a final evaluation after at most five and a half years. If the final review is positive the position will be converted to a permanent one. For candidates who are already further in their career an earlier evaluation is possible.

The department aims at increasing the number of female academic mathematicians employed by the institute. Female candidates are therefore particularly encouraged to apply.

For further information, see

The closing date is 10 December 2018.

Postdoctoral positions in Münster.

The (newly established) Cluster of Excellence “Mathematics Münster: Dynamics – Geometry – Structure” is offering several Postdoctoral Positions and “Young Research Groups”.

A “Young Research Group” is a group of two or three postdoctoral researchers with overlapping interests, who apply together to work within the Cluster of Excellence for a duration of up to four years.

For more information and the official vacancy, see .