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Big mapping class groups - lecture 2

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Multi angle
Auteurs : Calegari, Danny (Auteur de la conférence)
CIRM (Editeur )

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Résumé : Part I - Theory : In the "theory" part of this mini-course, we will present recent objects and phenomena related to the study of big mapping class groups. In particular, we will define two faithful actions of some big mapping class groups. The first is an action by isometries on a Gromov-hyperbolic graph. The second is an action by homeomorphisms on a circle in which the vertices of the graph naturally embed. We will describe some properties of the objects involved, and give some fruitful relations between the dynamics of the two actions. For example, we will see that loxodromic elements (for the first action) necessarily have rational rotation number (for the second action). Using these relations, we will explain how to construct non trivial quasimorphisms on subgroups of big mapping class groups. This includes joint work with Alden Walker.
Part II - Examples : In this part we will discuss a number of natural examples in which big mapping class groups and their subgroups arise. These include the inverse limit constructions of de Carvalho-Hall, the theory of finite depth (taut) foliations of 3-manifolds, the theory of “Artinization” of Thompson-like groups, two dimensional smooth dynamics, one dimensional complex dynamics (topology of the shift locus, Schottky spaces) and several other contexts. We will try to indicate how viewing these examples from the perspective of (big) mapping class groups is a worthwhile approach.

Mots-Clés : mapping class groups; hyperbolic geometry; complex dynamics

Codes MSC :
37FXX - complex dynamical systems
57Mxx - Low-dimensional topology

Ressources complémentaires :
http://math.uchicago.edu/~dannyc/books/big_mcg/big_mcg.html

    Informations sur la Vidéo

    Réalisateur : Recanzone, Luca
    Langue : Anglais
    Date de Publication : 11/06/2019
    Date de Captation : 21/05/2019
    Sous Collection : Research School
    Catégorie arXiv : Dynamical Systems ; Geometric Topology
    Domaine(s) : Systèmes Dynamiques & EDO ; Topologie
    Format : MP4 (.mp4) - HD
    Durée : 00:47:48
    Audience : Chercheurs
    Download : https://videos.cirm-math.fr/2019-05-21_Calegari_part2.mp4

Informations sur la Rencontre

Nom de la Rencontre : Dynamique au-delà de l'hyperbolicité uniforme / Dynamics Beyond Uniform Hyperbolicity
Organisateurs de la Rencontre : Bonatti, Christian ; Buzzi, Jérôme ; Crovisier, Sylvain ; Gan, Shaobo ; Pacifico, Maria José
Dates : 13/05/2019 - 24/05/2019
Année de la rencontre : 2019
URL de la Rencontre : https://conferences.cirm-math.fr/1947.html

Données de citation

DOI : 10.24350/CIRM.V.19525903
Citer cette vidéo: Calegari, Danny (2019). Big mapping class groups - lecture 2. CIRM. Audiovisual resource. doi:10.24350/CIRM.V.19525903
URI : http://dx.doi.org/10.24350/CIRM.V.19525903

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