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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Haluk Sengun

April 14, 2023

14:00

EST

Organized by Americas GNCG Seminar.

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…

January 12, 2021

15:00