Fabio Cipriani

### Spectral densities and hypertrace in NCG

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

### A Remark on the Tate Conjecture

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

### What is a Coarse Index, physically?

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

### Assembly in the Algebraic K-theory of Lawvere Theories

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

### Regular ideals and regular inclusions

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

### Cyclic Structure behind the Modular Gaussian Curvature

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

### Noncommutative ergodic theory of lattices in higher rank simple algebraic groups

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

### Decomposable C*-algebras and the UCT

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

### Elliptic trace map on chiral algebras

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

### Noncommutative geometry in Hochschild complexes

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

### Quantum geodesic flows and curvature

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

### On Gromov’s Dihedral extremality and rigidity conjectures

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

### A new approach to classifying nuclear C*-algebras

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

### K-theory of the reduced C*-algebra of a real reductive Lie group

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 for operator systems

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

### The lifting property for C*-algebras

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

### Dixmier trace formulas and negative eigenvalues of Schroedinger operators on noncommutative tori

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

### Isomorphisms between Type I graph C*-algebras

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

### Wick rotation and the positivity of energy in quantum field theory

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

### The Modular Hamiltonian and Classical/Quantum Information Theory

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

### Scattering theory and non-commutative geometry: A walk from the parentheses of Levinson to the hexagon of Cordes

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

### Classifying sufficiently connected PSC manifolds in 4 and 5 dimensions

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

### An index theoretical proof of Gromov’s cube inequality

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.

### Graded isomorphism problems for graph algebras

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

### C*-algebras and Leavitt path algebras for labelled graphs

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

### KK-equivalence for quantum projective spaces

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

### New foundations for functional analysis

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

### On the moduli space for Quantum Toric Varieties.

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

### A new perspective on symmetries and dynamics in quantum field theory, with the aid of C*-algebras

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

### Dirac Operators for Matrix Algebras Converging to Coadjoint Orbits

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

### Equvariant twisted KK-theory of noncompact Lie groups

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

### Characteristic polynomials and traces

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

### Classical gauge theory on quantum principal bundles

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

### Some results on continuous orbit equivalence rigidity

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

### Cartan pairs of algebras

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

### Superrigidity for dense subgroups of Lie groups and their actions on homogeneous space

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

### Cyclic Cohomology at 40: achievements and future prospects

International online conference. Fields Institute. Sept 27-Oct 1….
September 27, 2021
09:00
TBA
Organized by Americas GNCG Seminar.
Tristan Bice

### Dauns-Hofmann-Kumjian-Renault Duality for Fell Bundles and Structured C*-Algebras

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

### Kaplansky’s conjectures

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

### A crash course on NCG, from Heisenberg to foliations, time, the quantized calculus and the paradigm of spectral geometry

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

### On the Notion of Space

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

### Equilibrium states for the massive Sine-Gordon Theory in the Lorentzian signature

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 for singular foliations

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 converge to the sphere

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

### Noncommutative algebraic topology and hyperbolic dynamics

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

### Ortho-sets and Gelfand spectra.

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 and a K-theoretic Perspective on the Langlands Classification

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

### K-theory for Exceptional Extended Affine Weyl Groups

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.

### Nonproduct geometries: the Standard Model and gravity

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

### Spectral Triples and Zeta-Cycles

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

### Geometry of lamplighters groups

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

### Topological recursion of scalar fields in noncommutative geometry

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

### Wodzicki characteristic classes and diffeomorphism groups

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

### Localisations and the Kasparov product in unbounded KK-theory

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

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

### Invertible states of quantum lattice spin systems and their invariants

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

### Positive Line Bundles Over the Irreducible Quantum Flag Manifolds

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

### Semiclassical Weyl law and exact spectral asymptotics in noncommutative geometry

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

### A relative index theorem for incomplete manifolds and Gromov’s conjectures on positive scalar curvature

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

### Noncommutative convexity

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

### Approximation of functions of unbounded operators

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.

### Translation invariant noncommutative Dirichlet forms

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

### A coarse Cartan-Hadamard theorem with application to the coarse Baum-Connes conjecture

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

### An Introduction to Dendroidal Topology

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

### Higher Kazhdan projections, L²-Betti numbers, and the Coarse Baum-Connes conjecture

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

### Completely positive approximations revisited

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

### Hypergeometric Functions and Heat Coefficients on Noncommutative Tori

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

### Chern assembly map for discrete groups and index theory

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.

### The constructive Kasparov product

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

### A noncommutative extension of Mahler’s interpolation theorem

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

### Modular Spectral Triples arising from type III representations of the noncommutative torus

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

### Inhomogeneous pseudo-differential calculus

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

### Relating Morita equivalence in algebra and geometry via deformation quantization.

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.

### Twisted real structures for spectral triples

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

### Matrix models for non-commutative rational functions

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

### Around the Quasicentral Modulus

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

### Computational $$K$$-theory via the spectral localizer

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

### W*-rigidity paradigms for embeddings of II_1 factors

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

### Crossed products and the Atiyah problem

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

### Turaev-Viro State sum models with defects

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

### Scalar curvature, band width, and quantitative K-theory

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

### Scalar curvature of functional metrics on noncommutative tori

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

### Surgery sequences and higher invariants of Dirac operators

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

### Deformation quantization of coadjoint orbits

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

### Cyclic subsets, groupoids and VB-groupoids

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

### Generalized inductive limits with asymptotically order zero maps

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

### The algebraic approach to KK-theory

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

### Amenable actions of groups on C*-algebras

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

### Cyclic Cocycles for Proper Lie Group Actions

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

### Differential Geometry of Weightings

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

### Crystallization of C$^*$-algebras

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

### Testing low-degree polynomials in the noncommutative setting

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

### A Galois group on meromorphic germs and locality evaluators

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

### Toposes in arithmetic noncommutative geometry

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

### Truncated spectral triples on the computer

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

### The sub-Riemannian limit of a contact manifold

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

### Asymptotics of Cheeger constants and unitarisability of groups

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

### Non-Commutative Geometry and Materials Science

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

### The K-theory of quantized CW-complexes

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

### Index Theory for Fourier Integral Operators and the Connes-Moscovici Local Index Formulae

The index theory for operator algebras generated by pseudodifferential operators and Fourier integral operators, more specifically Lie groups of…
January 12, 2021
15:00
CET
Organized by Europe GNCG Seminar.
Zhaoting Wei

### Determinant line bundles and cohesive modules

December 16, 2020
19:00
UTC
Organized by Americas GNCG Seminar.
Iakovos Androulidakis

### The Heisenberg calculus of singular Lie filtration

December 9, 2020
19:00
UTC
Organized by Americas GNCG Seminar.
Sheagan John

### Secondary higher invariants, and cyclic cohomology for groups of polynomial growth

December 2, 2020
19:00
UTC
Organized by Americas GNCG Seminar.
Francesca Arici

### SU(2)-symmetries and exact sequences of C*-algebras through subproduct systems

November 17, 2020
00:00
CET
Organized by Europe GNCG Seminar.
Nigel Higson

### The Oka principle and Novodvorskii’s theorem

November 11, 2020
19:00
UTC
Organized by Americas GNCG Seminar.
Ralf Meyer

### On the classification of group actions on C*-algebras up to equivariant KK-equivalence

November 10, 2020
15:00
CEST
Organized by Europe GNCG Seminar.
Rudy Rodsphon

### A KK-theoretical perspective on quantization commutes with reduction

November 4, 2020
19:00
UTC
Organized by Americas GNCG Seminar.
Christiaan van de Ven

### Asymptotic equivalence of two strict deformation quantizations and applications to the classical limit

November 3, 2020
15:00
CEST
Organized by Americas GNCG Seminar.
Matthew Lorentz

### The Hochschild cohomology of uniform Roe algebras

October 28, 2020
19:00
UTC
Organized by Americas GNCG Seminar.
Boris Tsygan

### Some remarks on operations on Hochschild and cyclic complexes

October 27, 2020
15:00
CEST
Organized by Europe GNCG Seminar.
Jonathan Block

### Singular foliations and characteristic classes

October 21, 2020
19:00
UTC
Organized by Americas GNCG Seminar.
Henri Moscovici

### Differentiable Characters and Hopf Cyclic Cohomology

October 20, 2020
15:00
CEST
Organized by Europe GNCG Seminar.