Haluk Sengun
Theta correspondence is a major theme in the theory of automorphic forms and in representation theory. The local version…
April 14, 2023
14:00
EST
Organized by Americas GNCG Seminar.
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Robert Yuncken
In 1979, Helffer and Nourrigat made a very broad conjecture about the hypoellipticity of differential operators which are polynomials…
March 31, 2023
14:00
EST
Organized by Americas GNCG Seminar.
Jinmin Wang
In this talk, I will speak about an index theoretical approach to a series of Gromov’s questions related to…
March 3, 2023
14:00
EST
Organized by Americas GNCG Seminar.
Jesus Sanchez Jr
In recent work, Higson and Yi developed a new perspective on Getzler’s symbol calculus, reinterpreting the latter in terms…
February 17, 2023
14:00
EST
Organized by Americas GNCG Seminar.
Xin Li
Topological groupoids describe orbit structures of dynamical systems by capturing their local symmetries. The group of global symmetries, which…
February 3, 2023
14:00
EST
Organized by Americas GNCG Seminar.
Huanhuan Li
We investigate graded K-theory for Leavitt path algebras. There is a tight connection between the algebraic structure of Leavitt…
December 2, 2022
14:00
EST
Organized by Americas GNCG Seminar.
Bernardo Uribe
Topological insulators are materials that are insulating in their interior but can support the flow of electrons on their surface….
November 18, 2022
14:00
EST
Organized by Americas GNCG Seminar.
Sven Bachmann
Although non-commutative geometry is historically the latest tool introduced to understand topological phases in quantum matter — such as…
November 11, 2022
14:00
EST
Organized by Americas GNCG Seminar.
Teun van Nuland
The spectral action principle, introduced by Chamseddine and Connes in ’97, produces particle physical models out of spectral triples,…
October 28, 2022
14:00
EDT
Organized by Americas GNCG Seminar.
Ulrich Bunke
I will give an overview over basic features of equivariant coarse homotopy theory. Thereby the emphasis is put on…
September 30, 2022
14:00
EST
Organized by Americas GNCG Seminar.
Omar Mohsen
In this talk we will give an introduction to maximally hypoelliptic differential operators. This is a class of differential…
September 16, 2022
14:00
EST
Organized by Americas GNCG Seminar.
Alain Connes
June 22, 2022
14:00
CEST
Organized by Europe GNCG Seminar.
Fabio Cipriani
We introduce spectral weights ρ(L) of positive, self-adjoint operators L having dis-crete spectrum away from zero. We provide criteria for measurability and…
May 18, 2022
14:00
CEST
Organized by Europe GNCG Seminar.
Yves Andre
The Tate conjecture has two parts: i) Tate classes are generated by algebraic classes, ii) semisimplicity of Galois representations…
May 6, 2022
15:00
EST
Organized by Americas GNCG Seminar.
Guo Chuang Thiang
The coarse index of J. Roe beautifully expands index theory to noncompact manifolds. It appears abstract at first glance,…
May 4, 2022
14:00
CEST
Organized by Europe GNCG Seminar.
Anna Marie Bohmann
Lawvere’s algebraic theories are an elegant and flexible way of encoding algebraic structures, ranging from group actions on sets…
April 29, 2022
15:00
EST
Organized by Americas GNCG Seminar.
Sarah Reznikoff
We examine the regular ideals of C*-algebras, examining which properties are preserved under quotients by these as well as…
April 20, 2022
14:00
CEST
Organized by Europe GNCG Seminar.
Yang Liu
We will report some new conceptual interpretation on a simple functional relation attached to the modular Gaussian curvature on…
March 23, 2022
14:00
CET
Organized by Europe GNCG Seminar.
Cyril Houdayer
In this talk, I will present a noncommutative Nevo-Zimmer theorem for actions of lattices in higher rank simple algebraic…
March 18, 2022
15:00
EST
Organized by Americas GNCG Seminar.
Rufus Willett
A $C^*$-algebra satisfies the UCT if it is K-theoretically the same as a commutative $C^*$-algebra, in some sense. Whether…
March 11, 2022
15:00
EST
Organized by Americas GNCG Seminar.
Gui Zhengping
Trace map on deformation quantized algebra leads to the algebraic index theorem. We investigate a two dimensional chiral analogue…
March 9, 2022
14:00
CET
Organized by Europe GNCG Seminar.
Ralph Kaufmann
The fact that Hochschild cochain complexes are not commutative, but only commutative up to a controlled homotopy was a…
February 25, 2022
15:00
EST
Organized by Americas GNCG Seminar.
Shahn Majid
We study geodesics flows on curved quantum Riemannian geometries using a recent formulation in terms of bimodule connections and…
February 23, 2022
14:00
CET
Organized by Europe GNCG Seminar.
Zhizhang Xie
In this talk, I will present my recent joint work with Jinmin Wang and Guoliang Yu on Gromov’s dihedral…
February 11, 2022
15:00
EST
Organized by Americas GNCG Seminar.
Jamie Gabe
An indispensable tool for studying C*-algebras is through its double dual (which is a von Neumann algebra). For instance,…
February 9, 2022
14:00
CET
Organized by Europe GNCG Seminar.
Yanli Song
In 1987, Antony Wassermann announced a result of the structure of reduced $C^∗$-algebra of a connected, linear real reductive group,…
January 28, 2022
15:00
EST
Organized by Americas GNCG Seminar.
Ivan Todorov
Morita equivalence, having arisen first in Algebra, has had a continuing impact on non-commutative analysis, after its introduction into…
January 26, 2022
14:00
CET
Organized by Europe GNCG Seminar.
Gilles Pisier
We give several characterizations of the lifting property (LP in short) using the maximal tensor product for $C^*$- algebras. The…
January 14, 2022
15:00
EST
Organized by Americas GNCG Seminar.
Raphael Ponge
In this talk, we shall first address a question raised by Alain Connes during a conference at Fudan University…
January 10, 2022
09:00
UTC
Organized by Asia-Pacific GNCG Seminar.
Søren Eilers
The class of Type I C*-algebras was prominently studied in the early days of C*-algebra theory due to their…
December 20, 2021
09:00
UTC
Organized by Asia-Pacific GNCG Seminar.
Graeme Segal
I shall present joint work with Maxim Kontsevich describing an interesting domain of complex metrics on a smooth manifold….
December 17, 2021
15:00
EST
Organized by Americas GNCG Seminar.
Roberto Longo
I present the key concept of entropy of a vector in a complex Hilbert space with respect to a…
December 15, 2021
15:30
CET
Organized by Europe GNCG Seminar.
Serge Richard
In 1949, Levinson stated a relation between the number of bound states of a quantum mechanical system and an…
December 6, 2021
09:00
UTC
Organized by Asia-Pacific GNCG Seminar.
Chao Li
In this talk, I will discuss some recent developments on the topology of closed manifolds admitting Riemannian metrics of…
December 3, 2021
15:00
EST
Organized by Americas GNCG Seminar.
Jinmin Wang
The classical Bonnet-Myers theorem states that positive section curvature or positive Ricci curvature controls the scale of a manifold….
December 1, 2021
15:30
CET
Organized by Europe GNCG Seminar.
Adam Dor-On
In a seminal 1973 paper, Williams recast conjugacy and eventual conjugacy for subshifts of finite type purely in terms…
November 22, 2021
09:00
UTC
Organized by Asia-Pacific GNCG Seminar.
Gilles de Castro
Since the work of Cuntz and Krieger in 1980, there has been an interest in studying C*–algebras associated with…
November 19, 2021
15:00
EST
Organized by Americas GNCG Seminar.
Sophie Mikkelsen
In this talk we present an explicit KK-equivalence between the noncommutative $C^*$-algebra of continuous functions on the quantum complex…
November 17, 2021
14:00
CET
Organized by Europe GNCG Seminar.
Dustin Clausen
I will discuss joint work with Peter Scholze in which we propose replacements for the standard categories of topological…
November 12, 2021
15:00
EST Toronto
Organized by Americas GNCG Seminar.
Ernesto Lupercio
Just as the quantum torus generalizes the ordinary commutative torus, quantum toric varieties generalize ordinary ones. But unlike ordinary…
November 5, 2021
15:00
EST
Organized by Americas GNCG Seminar.
Kasia Rejzner
In this talk I will present how symmetries are treated in a recent C*-algebraic formulation of interacting quantum field…
November 3, 2021
14:00
CET
Organized by Europe GNCG Seminar.
Marc Rieffel
In the high-energy physics literature one finds statements such as “matrix algebras converge to the sphere”. Earlier I provided…
October 29, 2021
15:00
EDT
Organized by Americas GNCG Seminar.
Alex Chi-Kwong Fok
The Freed-Hopkins-Teleman Theorem asserts a canonical link between the equivariant twisted K-theory of a compact Lie group equipped with…
October 25, 2021
09:00
UTC
Organized by Asia-Pacific GNCG Seminar.
Inna Zakharevich
In this talk we give a description of a lift of the Dennis trace and the characteristic polynomial to…
October 22, 2021
15:00
EST (Toronto)
Organized by Americas GNCG Seminar.
Branimir Cacic
In his very first note on NC differential geometry, Connes introduced constant curvature connections on Heisenberg bimodules over an…
October 20, 2021
14:00
CEST
Organized by Europe GNCG Seminar.
Yongle Jiang
In this talk, we discuss continuous orbit equivalence (coe for short) between two continuous group actions on compact spaces….
October 11, 2021
09:00
UTC
Organized by Asia-Pacific GNCG Seminar.
Benjamin Steinberg
In the seventies, Feldman and Moore studied Cartan pairs of von Neumann algebras. These pairs consist of an algebra A and a…
October 8, 2021
15:00
EST
Organized by Americas GNCG Seminar.
Stefaan Vaes
An essentially free group action of a discrete group $\Gamma$ on a measure space $(X,\mu)$ is called W*-superrigid if…
October 6, 2021
14:00
CEST
Organized by Europe GNCG Seminar.
Many Speakers
International online conference. Fields Institute. Sept 27-Oct 1….
September 27, 2021
09:00
TBA
Organized by Americas GNCG Seminar.
Tristan Bice
The famous Gelfand duality lies at the heart of C*-algebra theory and much work over the past 80 years…
September 27, 2021
09:00
UTC
Organized by Asia-Pacific GNCG Seminar.
Giles Gardam
The Kadison–Kaplansky conjecture states that the reduced C*-algebra of a torsion-free discrete group has no idempotents other than 0…
September 17, 2021
15:00
EST (Toronto)
Organized by Americas GNCG Seminar.
Alain Connes
It will be a relaxed style expository lecture where ideas will be emphasized rather than technicalities. Zoom Link <https://us02web.zoom.us/j/84346778532?pwd=Wm5yd1E2KzUzNHNmR2RHZ0JxdEFWUT09>Meeting…
September 8, 2021
15:00
Central European Summer time (GMT+2)
Organized by Americas GNCG Seminar.
Alain Connes
I will analyze two fundamental “spaces” using the paradigms of spectral and of algebraic geometry. The spectral paradigm is…
September 3, 2021
15:00
EST (Toronto)
Organized by Americas GNCG Seminar.
Dorothea Bahns
In my talk I will report on recent joint work with Kasia Rejzner and Nicola Pinamonti on the massive…
June 23, 2021
14:00
CEST
Organized by Europe GNCG Seminar.
Lachlan MacDonald
Chern-Weil theory describes a procedure for constructing the characteristic classes of a smooth manifold from geometric data (such as…
June 21, 2021
09:00
UTC
Organized by Asia-Pacific GNCG Seminar.
David Kyed
The Podleś spheres, which are q-deformed analogues of the 2-sphere, are among the most classical objects in non-commutative geometry, but…
June 16, 2021
14:00
CEST
Organized by Europe GNCG Seminar.
Valerio Proietti
The hyperbolic sets of Smale’s Axiom A systems have been defined in the topological setting by Ruelle. We will…
June 14, 2021
09:00
UTC
Organized by Asia-Pacific GNCG Seminar.
Chi-Keung Ng
Motivated by quantum states with zero transition probability, we introduce the notion of ortho-set which is a set equipped…
June 9, 2021
14:00
CEST
Organized by Europe GNCG Seminar.
Nigel Higson
The Oka principle in complex geometry asserts that continuous structures in a variety of contexts, including vector bundles on…
June 9, 2021
15:15
UTC
Organized by Americas GNCG Seminar.
Nick Wright
Affine Weyl groups are a class of groups for which the group C^*-algebra can in principle be understood directly. …
June 7, 2021
09:00
UTC
Organized by Asia-Pacific GNCG Seminar.
Arkadiusz Bochniak
Models of noncommutative geometry that are beyond the usual almost-commutative framework that assumes product geometries, may lead to interesting…
June 2, 2021
14:00
CEST
Organized by Europe GNCG Seminar.
Alain Connes
This is joint work with C. Consani. When contemplating the low lying zeros of the Riemann zeta function one…
June 2, 2021
17:15
CEST
Organized by Americas GNCG Seminar.
Romain Tessera
In a joint work with Anthony Genevois, we classify up to quasi-isometry the class of lamplighter groups over one-ended finitely…
May 31, 2021
11:00
CEST
Organized by Asia-Pacific GNCG Seminar.
Raimar Wulkenhaar
Finite-dimensional approximations of noncommutative quantum field theories are matrix models. They often show rich mathematical structures: many of them…
May 26, 2021
14:00
CEST
Organized by Europe GNCG Seminar.
Steve Rosenberg
The Wodzicki residue can be used to build Chern classes and Chern-Simons classes for infinite dimensional bundles with pseudodifferential…
May 24, 2021
11:00
CEST
Organized by Asia-Pacific GNCG Seminar.
Koen van den Dungen
A well-known theorem by Connes and Skandalis provides sufficient conditions for finding the Kasparov product of two (bounded) Kasparov…
May 19, 2021
14:00
CEST
Organized by Europe GNCG Seminar.
Zhengwei Liu
Quantum Fourier Analysis is a subject that combines an algebraic Fourier transform (pictorial in the case of subfactor theory) with…
May 17, 2021
11:00
CEST
Organized by Asia-Pacific GNCG Seminar.
Nikita Sopenko
Recently methods of quantum statistical mechanics have been fruitfully applied to the study of phases of quantum lattice systems…
May 14, 2021
14:00
EDT
Organized by Americas GNCG Seminar.
Karen Strung
Noncommutative Kähler structures were recently introduced by Ó Buachalla as a framework for studying noncommutative Kähler geometry on quantum…
May 12, 2021
14:00
CEST
Organized by Europe GNCG Seminar.
Edward McDonald
I discuss how a Tauberian theorem for singular values of noncommuting operators allows us to prove Weyl asymptotic formulas…
May 10, 2021
09:00
UTC
Organized by Asia-Pacific GNCG Seminar.
Zhizhang Xie
In this talk, I will speak about my recent work on a relative index theorem for incomplete manifolds. As…
May 7, 2021
14:00
EDT
Organized by Americas GNCG Seminar.
Matthew Kennedy
Recently, Davidson and I introduced a new framework for noncommutative convexity and noncommutative function theory, along with a corresponding…
May 5, 2021
16:00
CEST
Organized by Europe GNCG Seminar.
Anna Skripka
We will discuss recent advancements in approximation of functional calculus arising in problems of mathematical physics and noncommutative geometry….
April 30, 2021
14:00
EDT
Organized by Americas GNCG Seminar.
Adam Skalski
We shall discuss a class of noncommutative probabilistic evolutions, understood as Markov semigroups acting on von Neumann algebras and…
April 28, 2021
14:00
CEST
Organized by Europe GNCG Seminar.
Shin-ichi Oguni
We show a coarse version of the Cartan-Hadamard theorem,which states that proper coarsely convex spaces are coarsely homotopyequivalent to…
April 26, 2021
11:00
CEST
Organized by Asia-Pacific GNCG Seminar.
Ieke Moerdijk
Simplicial sets form a classical and well known tool for modelling topological spaces, and more recently topologically enriched categories…
April 23, 2021
14:00
EDT
Organized by Americas GNCG Seminar.
Sanaz Pooya
The Baum-Connes conjecture, if it holds for a certain group, provides topological tools to compute the K-theory of its…
April 21, 2021
14:00
CET
Organized by Europe GNCG Seminar.
Wilhelm Winter
I will try to put into context several well-known and one or two new facts around completely positive approximations of…
April 19, 2021
09:00
UTC
Organized by Asia-Pacific GNCG Seminar.
Yang Liu
As the counterpart of conformal geometry, modular geometry on noncommutative manifolds explores the basic notions such as metric and curvature…
April 16, 2021
14:00
EDT
Organized by Americas GNCG Seminar.
Paulo Carrillo Rouse
In this talk, I will report on joint work with B.L. WANG (ANU Canberra) et H. WANG (ECNU Shanghai). Given a discrete group \(G\), I…
April 14, 2021
14:00
CEST
Organized by Europe GNCG Seminar.
Adam Rennie
I will outline efforts to describe the Kasparov product of two unbounded Kasparov modules in terms of another unbounded…
April 12, 2021
09:00
UTC
Organized by Asia-Pacific GNCG Seminar.
Jean-Eric Pin
Abstract. I will report on a result recently obtained with Christophe Reutenauer.Let p be a prime number. Mahler’s theorem…
April 9, 2021
14:00
EDT
Organized by Americas GNCG Seminar.
Francesco Fidaleo
We discuss the explicit construction of non type \(II_1\) representations and relative modular spectral triples of the noncommutative 2-torus…
April 7, 2021
14:00
CET
Organized by Europe GNCG Seminar.
Omar Mohsen
Using techniques from noncommutative geometry, I will present a very general inhomogeneous pseudo-differential calculus which allows us to obtain…
April 5, 2021
11:00
CEST
Organized by Asia-Pacific GNCG Seminar.
Henrique Bursztyn
The notion of Morita equivalence, native to ring theory, plays an important role in noncommutative geometry and has a…
April 2, 2021
14:00
EDT
Organized by Americas GNCG Seminar.
Adam Magee
Twisted real structures were introduced in 2016 as a generalisation of real structures for spectral triples which permit the…
March 31, 2021
14:00
CET
Organized by Europe GNCG Seminar.
Benoît Collins
We will report on arXiv:2103.05962, written in collaboration with Tobias Mai, Akihiro Miyagawa, Felix Parraud and Sheng Yin. Random matrix…
March 29, 2021
18:00
JST
Organized by Asia-Pacific GNCG Seminar.
Dan Voiculescu
The quasicentral modulus is a numerical invariant associated with a n-tuple of Hilbert space operators and a normed ideal of…
March 26, 2021
18:00
UTC
Organized by Americas GNCG Seminar.
Hermann Schulz-Baldes
Parings of \(K\)-theory with Fredholm modules given by Dirac operators can be computed numerically as the half-signature of a…
March 24, 2021
14:00
CET
Organized by Europe GNCG Seminar.
Stefaan Vaes
I will report on a recent joint work with Sorin Popa in which we undertake a systematic study of…
March 22, 2021
10:00
CET
Organized by Asia-Pacific GNCG Seminar.
Pere Ara
It was shown by Austin in 2013 that the question by Atiyah about the rationality of $\ell^2$-Betti numbers has…
March 19, 2021
14:00
EDT
Organized by Americas GNCG Seminar.
Catherine Meusburger
We explain how to construct a Traev-Viro style state sum model with defects, where defect planes are labelled by…
March 17, 2021
14:00
CET
Organized by Europe GNCG Seminar.
Hao Guo
I will discuss two connections between quantitative operator K-theory and scalar curvature, arising from recent work with Zhizhang Xie…
March 15, 2021
20:00
GMT+11
Organized by Asia-Pacific GNCG Seminar.
Asghar Ghorbanpour
In recent years, the investigation of geometries of noncommutative tori has attracted attention from both mathematics and physics. In…
March 12, 2021
14:00
EST
Organized by Americas GNCG Seminar.
Paolo Piazza
The analysis of the signature operator and of the spin-Dirac operator on a \(\Gamma\)-Galois covering of a smooth compact…
March 10, 2021
14:00
CET
Organized by Europe GNCG Seminar.
Shilin Yu
The “coadjoint orbit method” philosophy of Kirillov and Kostant suggests that there is a close connection between the unitary…
March 8, 2021
17:00
GMT+8
Organized by Asia-Pacific GNCG Seminar.
Claire Debord
In this talk, after recalling basic facts on groupoids, we will see that the structure of a groupoid G…
March 5, 2021
14:00
EST
Organized by Americas GNCG Seminar.
Kristin Courtney
In the 1990s, Blackadar and Kirchberg introduced NF algebras, which arise as limits of inductive systems where the connecting…
March 2, 2021
15:00
CET
Organized by Europe GNCG Seminar.
Joachim Cuntz
Kasparov’s KK-theory which is based on so called Kasparov-modules can be described much more algebraically using universal extensions and classifying maps…
March 1, 2021
10:00
CET
Organized by Asia-Pacific GNCG Seminar.
Alcides Buss
In this lecture I will explain recent developments in the theory of amenability for actions of groups on C*-algebras…
February 26, 2021
14:00
EST
Organized by Americas GNCG Seminar.
Xiang Tang
In this talk, we will report our exploration of cyclic cohomology of the Harish-Chandra Schwartz algebra of a connected…
February 23, 2021
15:00
CET
Organized by Europe GNCG Seminar.
Eckhard Meinrenken
The idea of assigning weights to local coordinate functions appears in many areas of mathematics, such as singularity theory,…
February 19, 2021
14:00
EST
Organized by Americas GNCG Seminar.
Sergiy Neshveyev
Given a C$^*$-algebra $A$ with an almost periodic time evolution we define a new C$^*$-algebra $A_c$ whose states parameterize…
February 16, 2021
15:00
CET
Organized by Europe GNCG Seminar.
Henry Yuen
In low-degree testing the following question is considered: given a multivariate function over a finite field, if a sufficiently…
February 12, 2021
14:00
EST
Organized by Americas GNCG Seminar.
Sylvie Paycha
Meromorphic germs (say at zero) in several variables with linear poles naturally arise in the context of renormalisation, which…
February 9, 2021
15:00
CET
Organized by Europe GNCG Seminar.
Jens Hemelaer
We give an introduction to topos theory from a geometric point of view, focusing on toposes that arise from…
February 5, 2021
14:00
EST
Organized by Americas GNCG Seminar.
Lisa Glaser
When describing a Riemannian geometry as a spectral triple, the algebra of functions on the geometry is infinite. But…
February 2, 2021
15:00
CET
Organized by Europe GNCG Seminar.
Pierre Albin
Contact manifolds, which arise naturally in mechanics, dynamics, and geometry, carry natural Riemannian and sub-Riemannian structures and it was…
January 29, 2021
14:00
EST
Organized by Americas GNCG Seminar.
Andreas Thom
Given a group Γ, we establish a connection between the unitarisability of its uniformly bounded representations and the asymptotic behaviour…
January 26, 2021
16:00
CET
Organized by Europe GNCG Seminar.
Emil Prodan
Starting with the pioneering works of Jean Bellissard in the 1980’s,Non-Commutative Geometry has emerged as one of sharpest tools…
January 22, 2021
14:00
EST
Organized by Americas GNCG Seminar.
Francesco D’Andrea
If a quantum space X can be obtained by “gluing” two subspaces Y and Z, there is a Mayer-Vietoris…
January 19, 2021
15:00
CET
Organized by Europe GNCG Seminar.
Elmar Schrohe
The index theory for operator algebras generated by pseudodifferential operators and Fourier integral operators, more specifically Lie groups of…
J