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Colloquia & Seminars


Current Seminars

No current seminar

Upcoming Seminars

  1. Member Seminar: Automorphisms of RAAGs: vast or skimpy?

    Location: MSRI: Simons Auditorium
    Speakers: Vincent Guirardel (Institut de Recherche Mathematique (IRMAR))

    Say that a group G involves all finite groups if for every finite group F, some finite index subgroup of G maps onto F.
    For instance, for n>2, SL_n(Z) does not involve all finite groups, whereas Out(F_n) does for n>1. The family of groups Out(A) of outer automorphisms of right angled Artin groups "interpolates" between SL_n(Z) and Out(F_n), and the goal of this talk is to describe the boundary between these 2 behaviours, within this family of groups. We also study other "vastness" properties like SQ-universality, of having many quasimorphisms, and we prove that the boundary happens to be the same. This is a joint work with Andrew Sale.

    Updated on Sep 14, 2016 10:13 AM PDT
  2. Working Seminar: Median Spaces

    Location: MSRI: Simons Auditorium
    Created on Sep 13, 2016 09:55 AM PDT
  3. Common Lunch

    Location: MSRI: Commons Room
    Created on Aug 25, 2016 01:46 PM PDT
  4. Graduate Student Seminar

    Location: MSRI: Baker Board Room
    Created on Aug 25, 2016 02:07 PM PDT
  5. Postdoc Seminar I

    Location: MSRI: Simons Auditorium
    Updated on Aug 26, 2016 09:23 AM PDT
  6. Postdoc Seminar II

    Location: MSRI: Simons Auditorium
    Created on Aug 26, 2016 09:30 AM PDT
  7. Member Seminar: Discontinuous Motions of limit sets

    Location: MSRI: Simons Auditorium
    Speakers: Mahan Mj (Tata Institute of Fundamental Research)

    It is well known, thanks to work of Mane-Sad-Sullivan  that for a parametrized family of quasifuchsian groups (or equivalently convex cocompact discrete surface subgroups of PSl(2,C)) the limit set moves holomorphically on the Riemann sphere. We shall discuss what happens when a sequence of such groups converges to a non-quasifuchsian group. A discontinuity phenomenon was discovered in joint work with Caroline Series. In further work with Ken'ichi Ohshika, we characterize when precisely these discontinuities arise.

    Updated on Sep 20, 2016 03:59 PM PDT
  8. Working Seminar: Median Spaces

    Location: MSRI: Simons Auditorium
    Created on Sep 13, 2016 09:56 AM PDT
  9. Common Lunch

    Location: MSRI: Commons Room
    Created on Aug 25, 2016 01:47 PM PDT
  10. Graduate Student Seminar

    Location: MSRI: Baker Board Room
    Created on Aug 25, 2016 02:07 PM PDT
  11. Postdoc Seminar I

    Location: MSRI: Simons Auditorium
    Created on Aug 26, 2016 09:24 AM PDT
  12. Postdoc Seminar II

    Location: MSRI: Simons Auditorium
    Created on Aug 26, 2016 09:31 AM PDT
  13. Member Seminar: Cannon-Thurston maps for hyperbolic free group extensions

    Location: MSRI: Simons Auditorium
    Speakers: Ilya Kapovich (University of Illinois at Urbana-Champaign)

    Let $F_N$ be a free group of finite rank $N\ge 3$ and let $\Gamma\le Out(F_N)$ be a finitely generated "convex cocompact" subgroup, that is, such that the orbit map from $\Gamma$ to the free factor complex of $F_N$ is a quasi-isometric embedding. Assume also that $\Gamma$ is purely atoroidal. In this case $\Gamma$ determines an extension group $E_\Gamma$ of $\Gamma$ with the quotient $E_\Gamma/F_N=\Gamma$, and it is known by a result of Dowdall and Taylor that the group $E_\Gamma$ is then word-hyperbolic. By a general result of Mitra the inclusion of $F_N$ in $E_\Gamma$ extends to a continuous surjective $F_N$-equivariant map between their hyperbolic boundaries $j: \partial F_N\to \partial E_\Gamma$, called the Cannon-Thurston map. We analyze the structure of this map and prove that the map is finite-to-one, with multiplicity at most $2N$. The talk is based on a joint paper with Spencer Dowdall and Sam Taylor. 

    Updated on Sep 20, 2016 03:53 PM PDT
  14. Working Seminar: Median Spaces

    Location: MSRI: Simons Auditorium
    Created on Sep 13, 2016 09:57 AM PDT
  15. Common Lunch

    Location: MSRI: Commons Room
    Created on Aug 25, 2016 01:48 PM PDT
  16. Graduate Student Seminar

    Location: MSRI: Baker Board Room
    Created on Aug 25, 2016 02:09 PM PDT
  17. Postdoc Seminar I

    Location: MSRI: Simons Auditorium
    Created on Aug 26, 2016 09:24 AM PDT
  18. Postdoc Seminar II

    Location: MSRI: Simons Auditorium
    Created on Aug 26, 2016 09:31 AM PDT
  19. Member Seminar

    Location: MSRI: Simons Auditorium
    Created on Aug 25, 2016 01:59 PM PDT
  20. Common Lunch

    Location: MSRI: Commons Room
    Created on Aug 25, 2016 01:49 PM PDT
  21. Math on YouTube

    Location: MSRI: Commons Room
    Created on Sep 13, 2016 09:50 AM PDT
  22. Graduate Student Seminar

    Location: MSRI: Baker Board Room
    Created on Aug 25, 2016 02:10 PM PDT
  23. Postdoc Seminar I

    Location: MSRI: Simons Auditorium
    Updated on Aug 26, 2016 09:25 AM PDT
  24. Postdoc Seminar II

    Location: MSRI: Simons Auditorium
    Created on Aug 26, 2016 09:32 AM PDT
  25. Member Seminar

    Location: MSRI: Simons Auditorium
    Created on Aug 25, 2016 01:59 PM PDT
  26. Common Lunch

    Location: MSRI: Commons Room
    Created on Aug 25, 2016 01:50 PM PDT
  27. Graduate Student Seminar

    Location: MSRI: Baker Board Room
    Created on Aug 25, 2016 02:11 PM PDT
  28. Postdoc Seminar I

    Location: MSRI: Simons Auditorium
    Created on Aug 26, 2016 09:26 AM PDT
  29. Postdoc Seminar II

    Location: MSRI: Simons Auditorium
    Created on Aug 26, 2016 09:32 AM PDT
  30. Member Seminar

    Location: MSRI: Simons Auditorium
    Created on Aug 25, 2016 02:00 PM PDT
  31. Common Lunch

    Location: MSRI: Commons Room
    Created on Aug 25, 2016 01:50 PM PDT
  32. Graduate Student Seminar

    Location: MSRI: Baker Board Room
    Updated on Sep 16, 2016 12:18 PM PDT
  33. Postdoc Seminar I

    Location: MSRI: Simons Auditorium
    Created on Aug 26, 2016 09:34 AM PDT
  34. Postdoc Seminar II

    Location: MSRI: Simons Auditorium
    Created on Aug 26, 2016 09:33 AM PDT
  35. Member Seminar

    Location: MSRI: Simons Auditorium
    Created on Aug 25, 2016 02:01 PM PDT
  36. Common Lunch

    Location: MSRI: Commons Room
    Created on Aug 25, 2016 01:52 PM PDT
  37. Member Seminar

    Location: MSRI: Simons Auditorium
    Created on Aug 25, 2016 02:01 PM PDT
  38. Common Lunch

    Location: MSRI: Commons Room
    Created on Aug 25, 2016 01:53 PM PDT
  39. Graduate Student Seminar

    Location: MSRI: Baker Board Room
    Created on Aug 25, 2016 02:12 PM PDT
  40. Postdoc Seminar I

    Location: MSRI: Simons Auditorium
    Created on Aug 26, 2016 09:26 AM PDT
  41. Postdoc Seminar II

    Location: MSRI: Simons Auditorium
    Created on Aug 26, 2016 09:34 AM PDT

Past Seminars

seminar
  1. Seminar Common Lunch

    Created on Aug 25, 2016 01:44 PM PDT
  2. Seminar Job Market Panel

    Created on Sep 16, 2016 11:22 AM PDT
  3. Seminar Common Lunch

    Created on Aug 25, 2016 01:41 PM PDT
There are more then 30 past seminars. Please go to Past seminars to see all past seminars.