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Veranstaltungskalender

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<< April 2017

Veranstaltungskalender Mai 2017

Juni 2017 >>
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6 Einträge gefunden

  • 04. Mai
    17:00 - 18:00
    Ort: 48-436
    Algebra, Geometrie und Computer Algebra

    Emil Norton, MPI Bonn: The sl_∞-crystal combinatorics of higher level Fock spaces

    A crystal is a type of directed graph encoding representation theoretic information. The crystal I will discuss is called the Heisenberg or <nobr></nobr> crystal, originally defined by Shan and Vasserot. Its vertices are multipartitions, and its arrows arise from a categorical action of a Heisenberg algebra on cyclotomic Cherednik category O. The representation theoretic meaning of this crystal is to keep track of one part of the support of simple modules. There are two crystals needed to determine supports; the other is the <nobr></nobr> crystal. Likewise, Dudas-Varagnolo-Vasserot recently constructed categorical actions of these two crystals on the unipotent category of finite classical groups in order to classify Harish-Chandra series. The problem of computing the arrows in the <nobr></nobr> crystal was reduced to a combinatorial problem by Thomas Gerber. I will explain the solution to this problem: the rule for the arrows, and the rule for determining depth of a multipartition in the crystal. This is joint work with Thomas Gerber.

     

     

     

  • 11. Mai
    13:45 - 15:15
    Ort: 48-208
    Graduate School

    Capraro, Patrick: Feynman Path Integrals in configuration space, momentum space and phase space for perturbative and polynomial

  • 11. Mai
    17:00 - 18:00
    Ort: 48-519
    Algebra, Geometrie und Computer Algebra

    Andreas Bächle, University Brussels: Rationality of groups and centers of integral group rings

    A finite group is called rational if all entries of its character table are rational integers. Being rational has significant implications for the structure of the group, e.g. it is a classical result of R. Gow that the only primes dividing the order of such a group are 2, 3 and 5, if the group is solvable. The concept of rationality was generalized in 2010 by D. Chillag and S. Dolfi by introducing the term (inverse) semi-rational group. It turned out that being an inverse semi-rational group has quite some impact in the study of integral group rings. We will discuss this connection and recent results.

  • 12. Mai
    13:30 - 15:00
    Ort: 48-208
    Graduate School

    Pham, Thi Ngoc Ha: Kinetic and Related Macroscopic Models for Chemotaxis on Networks

  • 23. Mai
    15:00 - 16:30
    Ort: Fraunhofer ITWM, E-409
    Graduate School

    Nurkanović, Merima: The Split tree for option pricing

  • 23. Mai
    17:15 - 18:15
    Ort: Raum 48-210
    Fachbereich Mathematik

    "Discrete Geodesic Paths in the Space of Images", Prof. Dr. Martin Rumpf, Universität Bonn

    The space of images will be considered as a Riemannian manifold, where the underlying Riemannian metric simultaneously measures the cost of image transport and intensity variation, introduced by Trouvé and Younes as the metamorphosis model. A robust and effective variational time discretization of geodesics paths will proposed and a variational scheme for a time discrete exponential map will investigated. The approach requires the definition of a discrete path energy consisting of a sum of consecutive image matching functionals over a set of image intensity maps and pairwise matching deformations. The talk will present existence and convergence results and discuss applications in image morphing and image animation.