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Colloquia & Seminars


  1. Minicourse

    Location: MSRI: Simons Auditorium
    Speakers: Michael Kapovich (University of California, Davis)

    This is a series of talks on my work with Bernhard Leeb and Joan Porti, aiming to extend the theory of geometrically finite discrete groups from rank 1 symmetric spaces to higher rank. I will start by reviewing various equivalent definitions of convex-cocompact subgroups of rank 1 Lie groups. Then I review basic geometry of higher rank symmetric spaces and their ideal boundaries. After that, I will define several notions of geometric finiteness in higher rank which generalize (some of) the rank one definitions and prove at least some of the implications between them.  My lectures will be continued by the ones by Bernhard Leeb, who will prove further equivalences of different definitions. 

    Updated on Feb 23, 2015 10:37 AM PST
  2. Women in Science

    Location: MSRI: Simons Auditorium
    Speakers: Shulamit Kahn (Boston University)
    Updated on Feb 05, 2015 12:10 PM PST
  1. GAAHD Research Seminar: Equidistribution of expanding translates of curves on homogeneous spaces

    Location: MSRI: Baker Board Room
    Speakers: Nimish Shah (Ohio State University)
    We consider a finite piece C of an analytic curve on a minimal expanding (abelian) horospherical subgroup of G=SL(n,R) associated to some element g in G. We consider the subgroup action of G on a finte volume homogeneous space X, and consider the trajectory of C from some point x in X. We want to find algebraic conditions on C which ensures that in the limit, the translates of Cx by powers of g get equidistributed in the closure of the G orbit from x. In this talk we describe some recent joint work with Lei Yang on this problem. 
     
    This kind of results have applications to metric properties of diophantine approximation.
    Updated on Mar 05, 2015 04:22 PM PST
  2. 3-Manifold Seminar

    Location: 939 Evans Hall
    Speakers: Ian Agol (University of California, Berkeley)
    The topic this semester is representations of 3-manifold groups into SL_2 C. Topics will include:
     
    - character varieties and curves of characters
    - ideal points, R-tree actions, tree actions associated to ideal points of curves
    - associating incompressible surfaces to tree actions and measured laminations to R-tree actions
    - volumes of representations and Chern-Simons invariant
    - Dehn invariants, the Bloch group, and extensions
    - volume rigidity, via simplicial volume and the barycenter map
    - the A-polynomial 
     
    Created on Jan 29, 2015 09:22 AM PST
  3. DMS Research Seminar: Counting, Randomness, and Renormalization

    Location: MSRI: Baker Board Room
    Speakers: Jayadev Athreya (University of Illinois at Urbana-Champaign)

    We describe several uses of the SL(2, R) action on moduli spaces of translation surfaces, in particular how to use ergodic theorems and recurrence results for the SL(2, R) action to understand counting and ergodicity properties for linear flows. Most of this will be based on work of Veech, Masur, Eskin-Masur, Forni, and Zorich. The talk will be elementary and assume very little background.

    Updated on Feb 27, 2015 12:04 PM PST
  4. Minicourse

    Location: MSRI: Baker Board Room
    Speakers: Michael Kapovich (University of California, Davis)

    This is a series of talks on my work with Bernhard Leeb and Joan Porti, aiming to extend the theory of geometrically finite discrete groups from rank 1 symmetric spaces to higher rank. I will start by reviewing various equivalent definitions of convex-cocompact subgroups of rank 1 Lie groups. Then I review basic geometry of higher rank symmetric spaces and their ideal boundaries. After that, I will define several notions of geometric finiteness in higher rank which generalize (some of) the rank one definitions and prove at least some of the implications between them.  My lectures will be continued by the ones by Bernhard Leeb, who will prove further equivalences of different definitions. 

    Created on Feb 23, 2015 10:40 AM PST
  5. DMS Postdoc Seminar: Degeneration of complex projective structures on surfaces that converges in the character variety

    Location: MSRI: Baker Board Room
    Speakers: Shinpei Baba (Ruprecht-Karls-Universität Heidelberg)

    A complex projective structure is a geometric structure on a surface modeled on the Riemann sphere. Then a complex projective structure has a holonomy representation from the fundamental group of the surface into PSL(2, C), which is not necessarily discrete.

    We discuss about ``neck-pinching'’ type degeneration of complex projective structures when their holonomy representations converge in the character variety.

    Created on Mar 05, 2015 04:20 PM PST
  6. GAAHD Postdoc Seminar: Sparse equidistribution under a unipotent flow

    Location: MSRI: Baker Board Room
    Speakers: Cheng Zheng (Ohio State University)

    We consider the orbits {pu(n^{1+γ})|n ∈ N} in Γ\PSL(2,R), where Γ is a non-uniform lattice in PSL(2,R) and u(t) is the standard unipotent group in PSL(2,R). Under a Diophantine condition on the intial point p, we show that {pu(n^{1+γ})|n ∈ N} is equidistributed in Γ\PSL(2,R) for small γ>0, which generalizes a result of Venkatesh.

    Created on Mar 05, 2015 04:18 PM PST
  7. DMS Research Seminar

    Location: MSRI: Simons Auditorium
    Updated on Feb 17, 2015 04:02 PM PST
  8. 3-Manifold Seminar

    Location: 939 Evans Hall
    Speakers: Ian Agol (University of California, Berkeley)
    The topic this semester is representations of 3-manifold groups into SL_2 C. Topics will include:
     
    - character varieties and curves of characters
    - ideal points, R-tree actions, tree actions associated to ideal points of curves
    - associating incompressible surfaces to tree actions and measured laminations to R-tree actions
    - volumes of representations and Chern-Simons invariant
    - Dehn invariants, the Bloch group, and extensions
    - volume rigidity, via simplicial volume and the barycenter map
    - the A-polynomial 
     
    Created on Jan 29, 2015 09:23 AM PST
  9. Open ended seminar

    Location: MSRI: Baker Board Room
    Updated on Mar 06, 2015 09:53 AM PST
  10. Minicourse

    Location: MSRI: Baker Board Room
    Speakers: Michael Kapovich (University of California, Davis)

    This is a series of talks on my work with Bernhard Leeb and Joan Porti, aiming to extend the theory of geometrically finite discrete groups from rank 1 symmetric spaces to higher rank. I will start by reviewing various equivalent definitions of convex-cocompact subgroups of rank 1 Lie groups. Then I review basic geometry of higher rank symmetric spaces and their ideal boundaries. After that, I will define several notions of geometric finiteness in higher rank which generalize (some of) the rank one definitions and prove at least some of the implications between them.  My lectures will be continued by the ones by Bernhard Leeb, who will prove further equivalences of different definitions. 

    Created on Feb 23, 2015 10:43 AM PST
  11. GAAHD Research Seminar

    Location: MSRI: Simons Auditorium
    Updated on Feb 20, 2015 09:46 AM PST
  12. Open ended seminar

    Location: MSRI: Baker Board Room
    Updated on Mar 06, 2015 09:53 AM PST
  13. DMS Research Seminar

    Location: MSRI: Simons Auditorium
    Updated on Jan 28, 2015 02:18 PM PST
  14. GAAHD Research Seminar

    Location: MSRI: Simons Auditorium
    Updated on Feb 20, 2015 09:47 AM PST
  15. 3-Manifold Seminar

    Location: 939 Evans Hall
    Speakers: Ian Agol (University of California, Berkeley)
    The topic this semester is representations of 3-manifold groups into SL_2 C. Topics will include:
     
    - character varieties and curves of characters
    - ideal points, R-tree actions, tree actions associated to ideal points of curves
    - associating incompressible surfaces to tree actions and measured laminations to R-tree actions
    - volumes of representations and Chern-Simons invariant
    - Dehn invariants, the Bloch group, and extensions
    - volume rigidity, via simplicial volume and the barycenter map
    - the A-polynomial 
     
    Created on Jan 29, 2015 09:25 AM PST
  16. Open ended seminar

    Location: MSRI: Baker Board Room
    Updated on Mar 06, 2015 09:52 AM PST
  17. DMS Research Seminar

    Location: MSRI: Simons Auditorium
    Speakers: Marc Burger (ETH Zurich), Fanny Kassel (Université de Lille I (Sciences et Techniques de Lille Flandres Artois))
    Updated on Jan 28, 2015 02:18 PM PST
  18. MSRI Evans Talk

    Location: 60 Evans Hall
    Speakers: Maryam Mirzakhani (Stanford University)
    Updated on Jan 15, 2015 09:40 AM PST
  19. GAAHD Research Seminar

    Location: MSRI: Simons Auditorium
    Updated on Feb 20, 2015 09:47 AM PST
  20. 3-Manifold Seminar

    Location: 939 Evans Hall
    Speakers: Ian Agol (University of California, Berkeley)
    The topic this semester is representations of 3-manifold groups into SL_2 C. Topics will include:
     
    - character varieties and curves of characters
    - ideal points, R-tree actions, tree actions associated to ideal points of curves
    - associating incompressible surfaces to tree actions and measured laminations to R-tree actions
    - volumes of representations and Chern-Simons invariant
    - Dehn invariants, the Bloch group, and extensions
    - volume rigidity, via simplicial volume and the barycenter map
    - the A-polynomial 
     
    Created on Jan 29, 2015 09:26 AM PST
  21. Open ended seminar

    Location: MSRI: Baker Board Room
    Updated on Mar 06, 2015 09:52 AM PST
  22. DMS Research Seminar

    Location: MSRI: Simons Auditorium
    Speakers: Marc Burger (ETH Zurich), Fanny Kassel (Université de Lille I (Sciences et Techniques de Lille Flandres Artois))
    Updated on Jan 28, 2015 02:17 PM PST
  23. GAAHD Research Seminar

    Location: MSRI: Simons Auditorium
    Updated on Feb 20, 2015 09:49 AM PST
  24. 3-Manifold Seminar

    Location: 939 Evans Hall
    Speakers: Ian Agol (University of California, Berkeley)
    The topic this semester is representations of 3-manifold groups into SL_2 C. Topics will include:
     
    - character varieties and curves of characters
    - ideal points, R-tree actions, tree actions associated to ideal points of curves
    - associating incompressible surfaces to tree actions and measured laminations to R-tree actions
    - volumes of representations and Chern-Simons invariant
    - Dehn invariants, the Bloch group, and extensions
    - volume rigidity, via simplicial volume and the barycenter map
    - the A-polynomial 
     
    Created on Jan 29, 2015 09:28 AM PST
  25. Open ended seminar

    Location: MSRI: Baker Board Room
    Updated on Mar 06, 2015 09:52 AM PST
  26. DMS Research Seminar

    Location: MSRI: Simons Auditorium
    Speakers: Marc Burger (ETH Zurich), Fanny Kassel (Université de Lille I (Sciences et Techniques de Lille Flandres Artois))
    Updated on Jan 28, 2015 02:16 PM PST
  27. MSRI Evans Talk

    Location: 60 Evans Hall
    Speakers: Hee Oh (Yale University)
    Updated on Jan 15, 2015 09:42 AM PST
  28. GAAHD Research Seminar

    Location: MSRI: Simons Auditorium
    Updated on Feb 20, 2015 09:49 AM PST
  29. 3-Manifold Seminar

    Location: 939 Evans Hall
    Speakers: Ian Agol (University of California, Berkeley)
    The topic this semester is representations of 3-manifold groups into SL_2 C. Topics will include:
     
    - character varieties and curves of characters
    - ideal points, R-tree actions, tree actions associated to ideal points of curves
    - associating incompressible surfaces to tree actions and measured laminations to R-tree actions
    - volumes of representations and Chern-Simons invariant
    - Dehn invariants, the Bloch group, and extensions
    - volume rigidity, via simplicial volume and the barycenter map
    - the A-polynomial 
     
    Created on Jan 29, 2015 09:29 AM PST
  30. Open ended seminar

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

    Location: MSRI: Simons Auditorium
    Speakers: Marc Burger (ETH Zurich), Fanny Kassel (Université de Lille I (Sciences et Techniques de Lille Flandres Artois))
    Updated on Jan 28, 2015 02:15 PM PST
  32. GAAHD Research Seminar

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

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

    Location: MSRI: Simons Auditorium
    Speakers: Marc Burger (ETH Zurich), Fanny Kassel (Université de Lille I (Sciences et Techniques de Lille Flandres Artois))
    Updated on Jan 28, 2015 02:15 PM PST
  35. GAAHD Research Seminar

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

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

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

Past Seminars

seminar
  1. Seminar 3-Manifold Seminar

    Created on Jan 29, 2015 09:21 AM PST
  2. Seminar Open ended seminar

    Updated on Mar 06, 2015 09:53 AM PST
  3. Seminar 3-Manifold Seminar

    Created on Jan 29, 2015 09:19 AM PST
  4. Seminar 3-Manifold Seminar

    Created on Jan 29, 2015 09:18 AM PST
There are more then 30 past seminars. Please go to Past seminars to see all past seminars.