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Wydział Matematyki, Informatyki i Mechaniki Uniwersytetu Warszawskiego

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North Atlantic Noncommutative Geometry Seminar

Link do kanału youtube: https://www.youtube.com/channel/UCnHfrrAKk9Jaaw8oC2s_dSQ

Zoom platform link: https://us02web.zoom.us/j/83662713532?pwd=MFpVS1NlQkt4THVtMGdYNTR2Ym93UT09

Meeting ID: 836 6271 3532 Passcode: 764579


Prowadzący

  • Paul F. Baum
  • Francesco D'Andrea
  • Ludwik Dąbrowski
  • Søren Eilers
  • Piotr M. Hajac
  • Frédéric Latrémolière
  • Ryszard Nest
  • Marc A. Rieffel
  • Wojciech Szymański

Sala

Lista referatów

  • 2022-04-06, godz. 17:15, zoom

    WALTER VAN SUIJLEKOM (Radboud Universiteit)

    NONCOMMUTATIVE SPACES AT FINITE RESOLUTION

    We extend the traditional framework of noncommutative geometry in order to deal with two types of approximation of metric spaces. On the one hand, we consider spectral truncations of geometric spaces, while on the other hand, we consider metric spaces up to finite resolution. In our approach, the tr...

  • 2022-03-30, godz. 17:15, ZOOM

    ALESSANDRO CAROTENUTO (Univerzita Karlova)

    A BOREL-WEIL THEOREM FOR IRREDUCIBLE QUANTUM FLAG MANIFOLDS

    The Borel-Weil theorem is a fundamental result in (classical) geometric representation theory. It realizes each irreducible representation of a complex semisimple Lie algebra as the space of holomorphic sections over a flag manifold. I will give a noncommutative generalization of the Borel-Weil theo...

  • 2022-03-23, godz. 17:15, ZOOM

    RALF MEYER (Universität Göttingen)

    C*-ALGEBRAS DEFINED BY GROUPOID CORRESPONDENCES

    In this talk, I define correspondences between étale groupoids, and show that they contain topological graphs and self-similarities of groups and graphs as special cases. A correspondence between two groupoids induces a C*-correspondence between the groupoid C...

  • 2022-03-16, godz. 17:15, ZOOM

    XIANG TANG (Washington University in St. Louis)

    THE HELTON-HOWE TRACE, THE CONNES-CHERN CHARACTER, AND QUANTIZATION

    In the early 70s, Helton and Howe proved a beautiful formula for the trace of commutators of Toeplitz operators. In the 80s, Connes greatly generalized the Helton-Howe trace formula using cyclic cohomology. The Connes-Chern character contains the Helton-Howe trace as the top degree compone...

  • 2022-03-09, godz. 17:15, ZOOM

    RYSZARD NEST (Københavns Universitet)

    PROJECTIVE REPRESENTATION THEORY FOR COMPACT QUANTUM GROUPS AND THE BAUM-CONNES ASSEMBLY MAP

    We study the theory of projective representations for a compact quantum group G, i.e. actions of G on B(H) for some Hilbert space H. We show that any such projective representation is inner, and hence is induced by an Ω-twisted representation for some unitary...

  • 2022-03-02, godz. 17:15, ZOOM

    YANG LIU (SISSA)

    CYCLIC STRUCTURE BEHIND THE MODULAR GAUSSIAN CURVATURE

    The modular Gaussian curvature on noncommutative two-tori introduced by Connes and Moscovici leads to a functional relation derived from its variational nature, which is a novel feature purely due to the noncommutativity. I will begin with the differential calculus behind the curvature computation, ...

  • 2022-01-26, godz. 17:15, ZOOM

    TOMASZ MASZCZYK (Uniwersytet Warszawski)

    THE MULTIPLICATIVE K-THEORY TYPE OF QUANTUM CW-COMPLEXES

    We enhance current noncommutative methods in topology to distinguish some very different classical homotopy types (e.g., a disconnected and a connected one) of finite CW-complexes, which cannot be distinguished using the Kasparov KK-theory. We achieve this by constructing a noncommutative counterpar...

  • 2022-01-19, godz. 17:15, ZOOM

    SOPHIE EMMA MIKKELSEN (Syddansk Universitet)

    ON THE CLASSIFICATION OF QUANTUM LENS SPACES

    There are many noncommutative deformations of classical spaces. For instance, the C*-algebras of quantum lens spaces can be defined as fixed-point subalgebras of the C*-algebras of Vaksman-Soibelman quantum spheres under actions of finite cyclic groups. Hong and Szymański described both the quantum...

  • 2022-01-12, godz. 17:15, ZOOM

    BRAM MESLAND (Universiteit Leiden)

    NONCOMMUTATIVE RIEMANNIAN PRINCIPAL BUNDLES

    In this talk, I will present a notion of principal G-spectral triple, with G a compact Lie group, put forward in my joint work with B. Ćaćić (New Brunswick). Our notion connects the algebraic approach to noncommutative principal bundles via principal comodule algebras and strong connections to th...

  • 2021-12-22, godz. 17:15, ZOOM

    JONATHAN ROSENBERG (University of Maryland)

    POSITIVE SCALAR CURVATURE ON MANIFOLDS WITH BOUNDARY

    Since work of Gromov and Lawson around 1980, we have known (under favorable circumstances) necessary and sufficient conditions for a closed manifold to admit a Riemannian metric of positive scalar curvature, but not much was known about analogous results for manifolds with boundary (and suitable bou...

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