# Mathematical Sciences Research Institute

Home > Scientific > 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. # Open ended seminar: Recurrence in random walks

Location: MSRI: Baker Board Room
Speakers: Jean-François Quint (University de Bordeaux 1)
Updated on Mar 05, 2015 04:24 PM PST
4. # 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
5. # 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
6. # 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
7. # 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
8. # DMS Research Seminar

Location: MSRI: Simons Auditorium
Updated on Feb 17, 2015 04:02 PM PST
9. # Lorentzian geometric structures seminar

Location: MSRI: Baker Board Room
Created on Feb 20, 2015 05:37 PM PST
10. # GAAHD Research Seminar

Speakers: Richard Sharp (University of Warwick)
Updated on Feb 20, 2015 09:44 AM PST
11. # 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
12. # Open ended seminar

Location: MSRI: Baker Board Room
Updated on Mar 06, 2015 09:53 AM PST
13. # Geometry and Analysis of Surface Group Representations

Location: MSRI: Baker Board Room
Created on Jan 22, 2015 04:31 PM PST
14. # 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
15. # Lorentzian geometric structures seminar

Location: MSRI: Baker Board Room
Created on Feb 20, 2015 05:40 PM PST
16. # GAAHD Research Seminar

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

Location: MSRI: Baker Board Room
Updated on Mar 06, 2015 09:53 AM PST
18. # Geometry and Analysis of Surface Group Representations

Location: MSRI: Baker Board Room
Created on Jan 22, 2015 04:33 PM PST
19. # DMS Research Seminar

Location: MSRI: Simons Auditorium
Updated on Jan 28, 2015 02:18 PM PST
20. # Lorentzian geometric structures seminar

Location: MSRI: Baker Board Room
Created on Feb 23, 2015 11:01 AM PST
21. # GAAHD Research Seminar

Location: MSRI: Simons Auditorium
Updated on Feb 20, 2015 09:47 AM PST
22. # 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
23. # Open ended seminar

Location: MSRI: Baker Board Room
Updated on Mar 06, 2015 09:52 AM PST
24. # Geometry and Analysis of Surface Group Representations

Location: MSRI: Baker Board Room
Speakers: Qiongling Li (Rice University), Andrew Sanders (University of Illinois at Chicago)
Created on Jan 22, 2015 04:34 PM PST
25. # 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
26. # DMS Postdoc Seminar

Location: MSRI: Simons Auditorium
Speakers: Guillaume Dreyer (University of Notre Dame), Nicolas de Saxce (Université de Paris XIII (Paris-Nord))
Created on Jan 28, 2015 01:51 PM PST
27. # GAAHD Postdoc Seminar

Location: MSRI: Simons Auditorium
Speakers: Guillaume Dreyer (University of Notre Dame), Nicolas de Saxce (Université de Paris XIII (Paris-Nord))
Created on Jan 28, 2015 01:53 PM PST
28. # Lorentzian geometric structures seminar

Location: MSRI: Baker Board Room
Created on Feb 23, 2015 11:02 AM PST
29. # MSRI Evans Talk

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

Location: MSRI: Simons Auditorium
Updated on Feb 20, 2015 09:47 AM PST
31. # 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
32. # Open ended seminar

Location: MSRI: Baker Board Room
Updated on Mar 06, 2015 09:52 AM PST
33. # Geometry and Analysis of Surface Group Representations

Location: MSRI: Baker Board Room
Speakers: Qiongling Li (Rice University), Andrew Sanders (University of Illinois at Chicago)
Created on Jan 22, 2015 04:35 PM 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 02:17 PM PST
35. # DMS Postdoc Seminar

Location: MSRI: Simons Auditorium
Speakers: Guillaume Dreyer (University of Notre Dame), Nicolas de Saxce (Université de Paris XIII (Paris-Nord))
Created on Jan 28, 2015 01:54 PM PST
36. # GAAHD Postdoc Seminar

Location: MSRI: Simons Auditorium
Speakers: Guillaume Dreyer (University of Notre Dame), Nicolas de Saxce (Université de Paris XIII (Paris-Nord))
Created on Jan 28, 2015 01:55 PM PST
37. # Lorentzian geometric structures seminar

Location: MSRI: Baker Board Room
Created on Feb 23, 2015 11:04 AM PST
38. # GAAHD Research Seminar

Location: MSRI: Simons Auditorium
Updated on Feb 20, 2015 09:49 AM PST
39. # 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
40. # Open ended seminar

Location: MSRI: Baker Board Room
Updated on Mar 06, 2015 09:52 AM PST
41. # Geometry and Analysis of Surface Group Representations

Location: MSRI: Baker Board Room
Speakers: Qiongling Li (Rice University), Andrew Sanders (University of Illinois at Chicago)
Created on Jan 22, 2015 04:36 PM PST
42. # 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
43. # DMS Postdoc Seminar

Location: MSRI: Simons Auditorium
Speakers: Guillaume Dreyer (University of Notre Dame), Nicolas de Saxce (Université de Paris XIII (Paris-Nord))
Created on Jan 28, 2015 01:57 PM PST
44. # GAAHD Postdoc Seminar

Location: MSRI: Simons Auditorium
Speakers: Guillaume Dreyer (University of Notre Dame), Nicolas de Saxce (Université de Paris XIII (Paris-Nord))
Created on Jan 28, 2015 02:02 PM PST
45. # Lorentzian geometric structures seminar

Location: MSRI: Baker Board Room
Created on Feb 23, 2015 11:06 AM PST
46. # MSRI Evans Talk

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

Location: MSRI: Simons Auditorium
Updated on Feb 20, 2015 09:49 AM PST
48. # 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
49. # Open ended seminar

Location: MSRI: Baker Board Room
Updated on Mar 06, 2015 09:51 AM PST
50. # Geometry and Analysis of Surface Group Representations

Location: MSRI: Baker Board Room
Speakers: Qiongling Li (Rice University), Andrew Sanders (University of Illinois at Chicago)
Created on Jan 22, 2015 04:38 PM PST
51. # 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
52. # DMS Postdoc Seminar

Location: MSRI: Simons Auditorium
Speakers: Guillaume Dreyer (University of Notre Dame), Nicolas de Saxce (Université de Paris XIII (Paris-Nord))
Created on Jan 28, 2015 02:04 PM PST
53. # GAAHD Postdoc Seminar

Location: MSRI: Simons Auditorium
Speakers: Guillaume Dreyer (University of Notre Dame), Nicolas de Saxce (Université de Paris XIII (Paris-Nord))
Created on Jan 28, 2015 02:05 PM PST
54. # Lorentzian geometric structures seminar

Location: MSRI: Baker Board Room
Created on Feb 23, 2015 11:07 AM PST
55. # GAAHD Research Seminar

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

Location: MSRI: Baker Board Room
Updated on Mar 06, 2015 09:51 AM PST
57. # Geometry and Analysis of Surface Group Representations

Location: MSRI: Baker Board Room
Speakers: Qiongling Li (Rice University), Andrew Sanders (University of Illinois at Chicago)
Created on Jan 22, 2015 04:39 PM PST
58. # 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
59. # DMS Postdoc Seminar

Location: MSRI: Simons Auditorium
Speakers: Guillaume Dreyer (University of Notre Dame), Nicolas de Saxce (Université de Paris XIII (Paris-Nord))
Created on Jan 28, 2015 02:06 PM PST
60. # GAAHD Postdoc Seminar

Location: MSRI: Simons Auditorium
Speakers: Guillaume Dreyer (University of Notre Dame), Nicolas de Saxce (Université de Paris XIII (Paris-Nord))
Created on Jan 28, 2015 02:07 PM PST
61. # Lorentzian geometric structures seminar

Location: MSRI: Baker Board Room
Created on Feb 23, 2015 11:08 AM PST
62. # GAAHD Research Seminar

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

Location: MSRI: Baker Board Room
Updated on Mar 06, 2015 09:50 AM PST
64. # Geometry and Analysis of Surface Group Representations

Location: MSRI: Baker Board Room
Speakers: Qiongling Li (Rice University), Andrew Sanders (University of Illinois at Chicago)
Created on Jan 22, 2015 04:40 PM PST
65. # 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

seminar
1. # SeminarDMS Research Seminar: Flows on irreducible parabolic geometries

Updated on Feb 27, 2015 12:13 PM PST
2. # SeminarGeometry and Analysis of Surface Group Representations: Cubic Differentials and Limits of Convex $RP^2$ Strucures under Neck Pinches

Updated on Feb 27, 2015 03:35 PM PST
3. # Seminar3-Manifold Seminar

Created on Jan 29, 2015 09:21 AM PST
4. # SeminarOpen ended seminar

Updated on Mar 06, 2015 09:53 AM PST
5. # SeminarGAAHD Research Seminar: Asymptotic properties of the Brownian motion on the universal covers of compact negatively curved manifolds

Updated on Feb 27, 2015 11:53 AM PST
6. # SeminarMSRI Evans Talk: Moduli of Geometric Structures

Updated on Feb 18, 2015 08:58 AM PST
7. # SeminarLorentzian geometric structures seminar: Anosov Structure on Margulis Space Time II

Updated on Feb 27, 2015 11:59 AM PST
8. # SeminarGAAHD Postdoc Seminar: Hausdorff dimension of divergent trajectories under the diagonal geodesic flow on product space of hyperbolic spaces

Updated on Feb 27, 2015 12:18 PM PST
9. # SeminarDMS Postdoc Seminar: MCG actions on character varieties

Updated on Feb 27, 2015 02:05 PM PST
10. # SeminarGAAHD Postdoc Seminar: Generalizations of Furstenberg's x2 x3 theorem

Updated on Feb 20, 2015 09:13 AM PST
11. # SeminarDMS Postdoc Seminar: Splittings, suspension flows, and polynomials for free-by-cyclic groups

Updated on Feb 20, 2015 09:36 AM PST
12. # SeminarMinicourse: Geometric finiteness in higher rank symmetric spaces

Updated on Feb 23, 2015 03:36 PM PST
13. # SeminarDMS Research Seminar: Eigenvalues and entropy of a Hitchin representation.

Updated on Feb 20, 2015 09:15 AM PST
14. # SeminarGeometry and Analysis of Surface Group Representations: Meromorphic quadratic differentials and harmonic maps to graphs

Updated on Feb 20, 2015 09:38 AM PST
15. # SeminarGAAHD Research Seminar: Quantum unique ergodicity on locally symmetric spaces

Updated on Feb 20, 2015 09:58 AM PST
16. # SeminarLorentzian geometric structures seminar: Anosov Structure on Margulis Space Time

Updated on Feb 20, 2015 11:24 AM PST
17. # SeminarGAAHD Postdoc Seminar: Pointwise equidistribution for one-parameter diagonal group action on $X=SL_n(\mathbb R)/SL_n(\mathbb Z)$

Updated on Feb 13, 2015 11:12 AM PST
18. # SeminarDMS Postdoc Seminar: Algebraic structure and topology of homeomorphism groups

Updated on Feb 13, 2015 11:10 AM PST
19. # SeminarMinicourse: Geometric finiteness in higher rank symmetric spaces

Updated on Feb 13, 2015 02:08 PM PST
20. # SeminarDMS Research Seminar: A differential geometric view on the moduli space of curves

Updated on Feb 13, 2015 11:17 AM PST
21. # Seminar Lorentzian geometric structures seminar: A dynamical proof that Margulis spacetimes are tame II

Created on Feb 13, 2015 11:00 AM PST
22. # SeminarGeometry and Analysis of Surface Group Representations: Positivity of Frenet curves

Updated on Feb 13, 2015 02:05 PM PST
23. # Seminar3-Manifold Seminar

Created on Jan 29, 2015 09:19 AM PST
24. # SeminarGAAHD Research Seminar: Borelian subgroups of simple Lie groups

Updated on Feb 13, 2015 11:24 AM PST
25. # SeminarGAAHD Research Seminar: Limit sets, Dimension and Distance sets

Updated on Feb 13, 2015 02:04 PM PST
26. # SeminarGAAHD Postdoc Seminar: Almost-Fuchsian space and entropy of minimal surfaces

Updated on Feb 05, 2015 11:45 AM PST
27. # SeminarDMS Postdoc Seminar: Quantum ergodicity and averaging operators on the sphere

Updated on Feb 05, 2015 04:21 PM PST
28. # SeminarDMS Research Seminar: The moduli space of convex real projective structures

Updated on Feb 05, 2015 01:54 PM PST
29. # SeminarGeometry and Analysis of Surface Group Representations: Higher Teichmueller space for SL(\infty,R)

Updated on Feb 05, 2015 04:07 PM PST
30. # Seminar3-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.