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Upcoming Colloquia & Seminars

  1. Geometry and Analysis of Surface Group Representations: Characters of representations and character varieties

    Location: MSRI: Baker Board Room
    Speakers: Adam Sikora (University at Buffalo (SUNY))
    We will discuss the extent representations of finitely generated groups into reductive groups are determined by their characters and the related question, whether trace functions generate the coordinate rings of character varieties.
    We will explore some anomalies related to SO(2n,C), for which the character variety is not the variety of characters.
    Updated on Apr 24, 2015 10:03 AM PDT
  2. DMS Research Seminar: Convex projective structures on non-hyperbolic three-manifolds

    Location: MSRI: Simons Auditorium
    Speakers: Jeffrey Danciger (University of Texas)

    Y. Benoist proved that if a closed three-manifold M admits a convex real projective structure, then M is topologically the union along tori of finitely many sub-manifolds each of which admits a complete finite volume hyperbolic structure on its interior. We describe some initial results in the direction of a potential converse to Benoist’s theorem. Specifically, we show that a cusped hyperbolic three-manifold may (under assumptions) be deformed to convex projective structures with totally geodesic torus boundary. Such structures may be (convexly) glued together whenever the geometry at the boundary matches up. In particular, we prove that many doubles of cusped hyperbolic three-manifolds admit convex projective structures. Joint work with Sam Ballas and Gye Seon Lee.

    Updated on Apr 24, 2015 10:19 AM PDT
  3. DMS Postdoc Seminar: Bounded cohomology of mapping class groups (and acylindrically hyperbolic groups)

    Location: MSRI: Simons Auditorium
    Speakers: Maria Beatrice Pozzetti (MSRI - Mathematical Sciences Research Institute)

    Bounded cohomology is a variation of usual cohomology that has many interesting geometric applications: for example it allows to define interesting invariants on some character varieties, and select maximal representations. However it is in general very difficult to compute and still poorly understood.

    I will discuss in which sense mapping class groups have enough hyperbolic features to ensure that their third bounded cohomology is infinite dimensional. This is joint work with Roberto Frigerio and Alessandro Sisto.

    Updated on Apr 24, 2015 03:26 PM PDT
  4. GAAHD Research Seminar

    Location: MSRI: Simons Auditorium
    Updated on Feb 20, 2015 09:50 AM PST
  5. Open ended seminar

    Location: MSRI: Baker Board Room
    Updated on Mar 06, 2015 09:51 AM PST
  6. DMS Research Seminar

    Location: MSRI: Simons Auditorium
    Speakers: Marc Burger (Eidgenössische TH Zürich-Hönggerberg), Fanny Kassel (Université de Lille I (Sciences et Techniques de Lille Flandres Artois))
    Updated on Jan 28, 2015 02:15 PM PST
  7. GAAHD Research Seminar

    Location: MSRI: Simons Auditorium
    Updated on Feb 20, 2015 09:52 AM PST
  8. Open ended seminar

    Location: MSRI: Baker Board Room
    Updated on Mar 06, 2015 09:50 AM PST
  9. DMS Research Seminar

    Location: MSRI: Simons Auditorium
    Speakers: Marc Burger (Eidgenössische TH Zürich-Hönggerberg), Fanny Kassel (Université de Lille I (Sciences et Techniques de Lille Flandres Artois))
    Updated on Jan 28, 2015 02:14 PM PST