NCG Seminar

The Noncommutative Geometry Seminar

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This is a virtual seminar on topics in noncommutative geometry, which is open to anyone anywhere interested in noncommutative geometry. It is the European/Asian node of the Global Noncommutative Geometry Seminar, and the talks planned for 2021-2022 can be found there.

Previous talks (2020-2021)

Tuesday September 22 (15:00-16:00 CEST), Alain Connes (IHÉS). Quasi-inner functions and quantized calculus. [slides]

Tuesday September 29 (15:00-16:00 CEST), Makoto Yamashita (Universitetet i Oslo)Homology and K-theory of torsion free ample groupoids and Smale spaces. [slides]

Tuesday October 6 (15:00-16:00 CEST), Nigel Higson (Penn State University)A counterfactual history of the hypoelliptic Laplacian. [slides]

Tuesday October 13 (15:00-16:00 CEST), Nadia Larsen (Universitetet i Oslo). Equilibrium states for C*-algebras of right LCM monoids. [slides]

Tuesday October 20 (15:00-16:00 CEST). Henri Moscovici (Ohio State University).  Differentiable Characters and Hopf Cyclic Cohomology. [slides]

Tuesday October 27 (15:00-16:00 CET). Boris Tsygan (Northwestern University). Some remarks on operations on Hochschild and cyclic complexes. [slides]

Tuesday November 3 (15:00-16:00 CET), Christiaan van de Ven (Università di Trento). Asymptotic equivalence of two strict deformation quantizations and applications to the classical limit . [slides]

Tuesday November 10 (15:00-16:00 CET), Ralf Meyer (Universität Göttingen). On the classification of group actions on C*-algebras up to equivariant KK-equivalence [slides]

Tuesday November 17 (15:00-16:00 CET), Francesca Arici (Universiteit Leiden). SU(2)-symmetries and exact sequences of C*-algebras through subproduct systems. [slides]

Tuesday November 24 (15:00-16:00 CET), Jens Kaad (Syddansk Universitet). Exterior products of compact quantum metric spaces. [slides]

Tuesday December 1 (15:00-16:00 CET), Guoliang Yu (Texas A&M University). Higher invariants in noncommutative geometry. [slides]

Tuesday December 8 (15:00-16:00 CET), Saskia Roos (Universität Potsdam). The twist of the free fermion. [slides]

Tuesday December 15 (15:00-16:00 CET), Teun van Nuland (Radboud Universiteit Nijmegen). The spectral action expanded in Yang-Mills and Chern-Simons forms. [slides]

Tuesday January 12 (15:00-16:00 CET), Elmar Schrohe (Leibniz Universität Hannover). Index theory for Fourier integral operators and the Connes-Moscovici local index formulae. [slides]

Tuesday January 19 (15:00-16:00 CET), Francesco D’Andrea (University of Naples “Federico II). The K-theory of quantized CW-complexes. [slides]

Tuesday January 26 (16:00-17:00 CET), Andreas Thom (TU Dresden).  Asymptotics of Cheeger constants and unitarisability of groups.

Tuesday February 2 (15:00-16:00 CET), Lisa Glaser (Universität Wien). Truncated spectral triples on the computer. [slides]

Tuesday February 9 (15:00-16:00 CET), Sylvie Paycha (Universität Potsdam). A Galois group on meromorphic germs and locality evaluators. [slides]

Tuesday February 16 (15:00-16:00 CET), Sergiy Neshveyev  (Universitetet i Oslo). Crystallization of C*-algebras. [slides]

Tuesday February 23 (15:00-16:00 CET), Xiang Tang (Washington University). Cyclic Cocycles for Proper Lie Group Actions. [slides]

Tuesday March 2 (15:00-16:00 CET), Kristin Courtney (Westfälische Wilhelms-Universität Münster). Generalized inductive limits with asymptotically order zero maps. [slides]

Wednesday March 10 (14:00-15:00 CET), Paolo Piazza (Universitá di Roma “Sapienza”). Surgery sequences and higher invariants of Dirac operators. [slides]

Wednesday March 17 (14:00-15:00 CET), Catherine Meusburger (Universität Erlangen-Nürnberg). Turaev-Viro State sum models with defects. [slides]

Wednesday March 24 (14:00-15:00 CET), Hermann Schulz-Baldes (Universität Erlangen-Nürnberg). Computational K-theory via the spectral localizer. [slides]

Wednesday March 31 (14:00-15:00 CEST), Adam Magee (SISSA, Trieste). Twisted real structures for spectral triples [slides]

Wednesday April 7 (14:00-15:00 CEST), Francesco Fidaleo (Università di Roma “Tor Vergata”). Modular Spectral Triples arising from type III  representations of the noncommutative torus [slides]

Wednesday April 14 (14:00-15:00 CEST), Paulo Carrillo Rouse (Université Toulouse III). Chern assembly map for discrete groups and index theory

Wednesday April 21 (14:00-15:00 CEST), Sanaz Pooya (IMPAN, Warsaw). Higher Kazhdan projections, L²-Betti numbers, and the Coarse Baum-Connes conjecture [slides]

Wednesday April 28 (14:00-15:00 CEST), Adam Skalski (IMPAN, Warsaw). Translation invariant noncommutative Dirichlet forms. [slides]

Wednesday May 5 (16:00-17:00 CEST), Matthew Kennedy (University of Waterloo). Noncommutative convexity. [slides]

Wednesday May 12 (14:00-15:00 CEST), Karen Strung (Czech Academy of Sciences, Prague). titel. Positive Line Bundles Over the Irreducible Quantum Flag Manifolds. [slides]

Wednesday May 19 (14:00-15:00 CEST), Koen van den Dungen (Universität Bonn). Localisations and the Kasparov product in unbounded KK-theory [slides]

Wednesday May 26 (14:00-15:00 CEST), Raimar Wulkenhaar (Westfälische Wilhelms-Universität Münster). Topological recursion of scalar fields in noncommutative geometry. [slides]

Wednesday June 2 (14:00-15:00 CEST), Arkadiusz Bochniak (Jagiellonian University, Krakow/ Indiana University Bloomington). Nonproduct geometries: the Standard Model and gravity. [slides]

Wednesday June 9 (14:00-15:00 CEST), Chi-Keung Ng (Nankai University). Ortho-sets and Gelfand spectra. [slides]

Wednesday June 16 (14:00-15:00 CEST), David Kyed (Syddansk Universitet). The Podleś spheres converge to the sphere. [slides]

Wednesday June 23 (14:00-15:00 CEST), Dorothea Bahns (Georg-August-Universität Göttingen). Equilibrium states for the massive Sine-Gordon Theory in the Lorentzian signature.