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H 1 Representation theory, effective ergodic theorems, and applications - Lecture 4

Auteurs : Nevo, Amos (Auteur de la Conférence)
CIRM (Editeur )

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    Résumé : Our first purpose is to show how aspects of the representation theory of (non-amenable) algebraic groups can be utilized to derive effective ergodic theorems for their actions. Our second purpose is to demonstrate some the many interesting applications that ergodic theorems with a rate of convergence have in a variety of problems. We will start by a discussion of property $T$ and show how to extend the spectral estimates it provides considerably beyond their usual formulations. We will also show how to derive best possible spectral estimates via representation theory in some cases. In turn, such spectral estimates will be used to derive effective ergodic theorems. Finally we will show how the rate of convergence in the ergodic theorem implies effective solutions in a host of natural problems, including the non-Euclidean lattice point counting problem, fast equidistribution of lattice orbits on homogenous spaces, and best possible exponents of Diophantine approximation on homogeneous algebraic varieties.

    Codes MSC :
    11F70 - Representation-theoretic methods; automorphic representations over local and global fields
    37A15 - General groups of measure-preserving transformations
    37A30 - Ergodic theorems, spectral theory, Markov operators
    37P55 - Arithmetic dynamics on general algebraic varieties

      Informations sur la Vidéo

      Langue : Anglais
      Date de publication : 16/07/2015
      Date de captation : 02/07/2015
      Collection : Research talks ; Dynamical Systems and Ordinary Differential Equations ; Number Theory
      Format : quicktime ; audio/x-aac
      Durée : 01:06:43
      Domaine : Dynamical Systems & ODE ; Number Theory
      Audience : Chercheurs ; Doctorants , Post - Doctorants
      Download : https://videos.cirm-math.fr/2015-07-02_Nevo_part4.mp4

    Informations sur la rencontre

    Nom de la rencontre : Group representations in dynamical systems and geometry / Représentations des groupes en géométrie et dynamique
    Organisateurs de la rencontre : Bufetov, Alexander ; Kuhn, Maria Gabriella ; Paoluzzi, Luisa ; Pavel, Nikitin ; Qiu, Yanqi
    Dates : 29/06/15 - 03/07/15
    Année de la rencontre : 2015
    URL Congrès : http://conferences.cirm-math.fr/1234.html

    Citation Data

    DOI : 10.24350/CIRM.V.18802003
    Cite this video as: Nevo, Amos (2015). Representation theory, effective ergodic theorems, and applications - Lecture 4. CIRM. Audiovisual resource. doi:10.24350/CIRM.V.18802003
    URI : http://dx.doi.org/10.24350/CIRM.V.18802003


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