# Mathematical Sciences Research Institute

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1. # Joint NSF Webinar - mandatory for US-based Postdocs

Location: MSRI: Baker Board Room
Updated on Sep 22, 2016 03:03 PM PDT
2. # Working Seminar: Ozawa's proof of Gromov's polynomial growth theorem

Location: MSRI: Simons Auditorium
Created on Sep 22, 2016 10:09 AM PDT
3. # Working Seminar: Projection complexes, rotating families, and beyond

Location: MSRI: Baker Board Room
Created on Sep 13, 2016 10:03 AM PDT
4. # Local rigidity of uniform lattices

Location: MSRI: Simons Auditorium
Speakers: Arie Levit (Weizmann Institute of Science)

A lattice is topologically locally rigid (t.l.r) if small deformations of it are isomorphic lattices. Uniform lattices in Lie groups were shown to be t.l.r by Weil [60']. We show that uniform lattices are t.l.r in any compactly generated topological group G.

A lattice is locally rigid (l.r) is small deformations arise from conjugation. It is a classical fact due to Weil [62'] that lattices in semi-simple Lie groups are l.r. Relying on our t.l.r results and on recent work by Caprace-Monod we prove l.r for uniform lattices in the isometry groups of proper geodesically complete CAT(0) spaces, with the exception of SL2(R) factors which occurs already in the classical case.

Moreover we are able to extend certain finiteness results due to Wang to this more general context of CAT(0) groups.

In the talk I will explain the above notions and results, and present some ideas from the proofs. This is a joint work with Tsachik Geladner.

Created on Sep 23, 2016 10:44 AM PDT

1. # Working Seminar: Ozawa's proof of Gromov's polynomial growth theorem

Created on Sep 22, 2016 10:10 AM PDT
2. # Working Seminar: Projection complexes, rotating families, and beyond

Location: MSRI: Baker Board Room
Created on Sep 13, 2016 10:04 AM PDT
3. # 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
4. # Working Seminar: Median Spaces

Location: MSRI: Simons Auditorium
Created on Sep 13, 2016 09:55 AM PDT
5. # Working Seminar: Counting problems in groups and spaces, and random walks

Location: MSRI: Simons Auditorium
Created on Sep 13, 2016 09:39 AM PDT
6. # Common Lunch

Location: MSRI: Commons Room
Created on Aug 25, 2016 01:46 PM PDT

Location: MSRI: Baker Board Room
Created on Aug 25, 2016 02:07 PM PDT
8. # Working Seminar: Out(Fn) - complexes

Location: MSRI: Simons Auditorium
Created on Sep 13, 2016 09:48 AM PDT
9. # Postdoc Seminar I

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

Location: MSRI: Simons Auditorium
Created on Aug 26, 2016 09:30 AM PDT
11. # Working Seminar: Projection complexes, rotating families, and beyond

Location: MSRI: Baker Board Room
Created on Sep 13, 2016 10:09 AM PDT
12. # 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
13. # Working Seminar: Median Spaces

Location: MSRI: Simons Auditorium
Created on Sep 13, 2016 09:56 AM PDT
14. # Working Seminar: Counting problems in groups and spaces, and random walks

Location: MSRI: Simons Auditorium
Created on Sep 13, 2016 09:40 AM PDT
15. # Common Lunch

Location: MSRI: Commons Room
Created on Aug 25, 2016 01:47 PM PDT

Location: MSRI: Baker Board Room
Created on Aug 25, 2016 02:07 PM PDT
17. # Working Seminar: Out(Fn) - complexes

Location: MSRI: Simons Auditorium
Created on Sep 13, 2016 09:48 AM PDT
18. # Postdoc Seminar I

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

Location: MSRI: Simons Auditorium
Created on Aug 26, 2016 09:31 AM PDT
20. # Working Seminar: Projection complexes, rotating families, and beyond

Location: MSRI: Baker Board Room
Created on Sep 13, 2016 10:10 AM PDT
21. # 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
22. # Working Seminar: Median Spaces

Location: MSRI: Simons Auditorium
Created on Sep 13, 2016 09:57 AM PDT
23. # Working Seminar: Counting problems in groups and spaces, and random walks

Location: MSRI: Simons Auditorium
Created on Sep 13, 2016 09:40 AM PDT
24. # Common Lunch

Location: MSRI: Commons Room
Created on Aug 25, 2016 01:48 PM PDT

Location: MSRI: Baker Board Room
Created on Aug 25, 2016 02:09 PM PDT
26. # Working Seminar: Out(Fn) - complexes

Location: MSRI: Simons Auditorium
Created on Sep 13, 2016 09:54 AM PDT
27. # Postdoc Seminar I

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

Location: MSRI: Simons Auditorium
Created on Aug 26, 2016 09:31 AM PDT
29. # Working Seminar: Projection complexes, rotating families, and beyond

Location: MSRI: Baker Board Room
Created on Sep 13, 2016 10:11 AM PDT
30. # Working Seminar: Projection complexes, rotating families, and beyond

Location: MSRI: Baker Board Room
Created on Sep 13, 2016 10:11 AM PDT
31. # Member Seminar

Location: MSRI: Simons Auditorium
Created on Aug 25, 2016 01:59 PM PDT
32. # Working Seminar: Counting problems in groups and spaces, and random walks

Location: MSRI: Simons Auditorium
Updated on Sep 13, 2016 09:41 AM PDT
33. # Common Lunch

Location: MSRI: Commons Room
Created on Aug 25, 2016 01:49 PM PDT

Location: MSRI: Commons Room
Created on Sep 13, 2016 09:50 AM PDT

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

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

Location: MSRI: Simons Auditorium
Created on Aug 26, 2016 09:32 AM PDT
38. # Working Seminar: Projection complexes, rotating families, and beyond

Location: MSRI: Baker Board Room
Created on Sep 13, 2016 10:12 AM PDT
39. # Member Seminar

Location: MSRI: Simons Auditorium
Created on Aug 25, 2016 01:59 PM PDT
40. # Working Seminar: Counting problems in groups and spaces, and random walks

Location: MSRI: Simons Auditorium
Created on Sep 13, 2016 09:42 AM PDT
41. # Common Lunch

Location: MSRI: Commons Room
Created on Aug 25, 2016 01:50 PM PDT

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

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

Location: MSRI: Simons Auditorium
Created on Aug 26, 2016 09:32 AM PDT
45. # Working Seminar: Projection complexes, rotating families, and beyond

Location: MSRI: Baker Board Room
Created on Sep 13, 2016 10:13 AM PDT
46. # Member Seminar

Location: MSRI: Simons Auditorium
Created on Aug 25, 2016 02:00 PM PDT
47. # Working Seminar: Counting problems in groups and spaces, and random walks

Location: MSRI: Simons Auditorium
Created on Sep 13, 2016 09:43 AM PDT
48. # Common Lunch

Location: MSRI: Commons Room
Created on Aug 25, 2016 01:50 PM PDT

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

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

Location: MSRI: Simons Auditorium
Created on Aug 26, 2016 09:33 AM PDT
52. # Working Seminar: Projection complexes, rotating families, and beyond

Location: MSRI: Baker Board Room
Created on Sep 13, 2016 10:14 AM PDT
53. # Member Seminar

Location: MSRI: Simons Auditorium
Created on Aug 25, 2016 02:01 PM PDT
54. # Working Seminar: Counting problems in groups and spaces, and random walks

Location: MSRI: Simons Auditorium
Created on Sep 13, 2016 09:43 AM PDT
55. # Common Lunch

Location: MSRI: Commons Room
Created on Aug 25, 2016 01:52 PM PDT
56. # Working Seminar: Projection complexes, rotating families, and beyond

Location: MSRI: Baker Board Room
Created on Sep 13, 2016 10:15 AM PDT
57. # Member Seminar

Location: MSRI: Simons Auditorium
Created on Aug 25, 2016 02:01 PM PDT
58. # Working Seminar: Counting problems in groups and spaces, and random walks

Location: MSRI: Simons Auditorium
Created on Sep 13, 2016 09:44 AM PDT
59. # Common Lunch

Location: MSRI: Commons Room
Created on Aug 25, 2016 01:53 PM PDT

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

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

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

seminar
1. # SeminarPostdoc Seminar II: Job talk: from the torus up

Updated on Sep 15, 2016 01:18 PM PDT
2. # SeminarPostdoc Seminar I: What is an L^2-Betti number?

Updated on Sep 15, 2016 01:18 PM PDT
3. # SeminarWorking Seminar: Out(Fn) - complexes

Created on Sep 13, 2016 09:47 AM PDT
4. # SeminarGraduate Student Seminar: Special cube complexes

Updated on Sep 19, 2016 09:03 AM PDT
5. # SeminarTopology Seminar: Thurston norm via Fox Calculus

Created on Sep 16, 2016 01:51 PM PDT
6. # SeminarTopology Seminar: Thurston norm via Fox Calculus

Created on Sep 16, 2016 01:52 PM PDT
7. # SeminarWorking seminar: Median spaces: Non-embedding into L^1 warm-up

Updated on Sep 16, 2016 12:11 PM PDT
8. # SeminarCommon Lunch

Created on Aug 25, 2016 01:44 PM PDT
9. # SeminarWorking Seminar: Counting problems in groups and spaces, and random walks

Created on Sep 08, 2016 11:33 AM PDT
10. # SeminarJob Market Panel

Created on Sep 16, 2016 11:22 AM PDT
11. # SeminarWorking Seminar: Median Spaces

Updated on Sep 15, 2016 02:08 PM PDT
12. # SeminarMember Seminar: Counting lattice points with respect to the Lipschitz metric

Updated on Sep 13, 2016 09:50 AM PDT
13. # SeminarWorking Seminar: Projection complexes, rotating families, and beyond

Created on Sep 13, 2016 10:02 AM PDT
14. # SeminarPostdoc Seminar II: Homology of finite covers of graphs and surfaces

Updated on Sep 09, 2016 01:22 PM PDT
15. # SeminarPostdoc Seminar I: The best of Simplicial Volume

Updated on Sep 09, 2016 01:21 PM PDT
16. # SeminarBerkeley Math Dept. Colloquium: Geometry and Analysis on Nilpotent Lie Groups

Created on Sep 13, 2016 09:20 AM PDT
17. # SeminarWorking Seminar: Out(Fn) - complexes

Created on Sep 09, 2016 08:37 AM PDT
18. # SeminarGraduate Student Seminar: asymptotic cones

Updated on Sep 13, 2016 09:29 AM PDT
19. # SeminarCommon Lunch

Created on Aug 25, 2016 01:41 PM PDT
20. # SeminarWorking Seminar: Counting problems in groups and spaces, and random walks

Created on Sep 08, 2016 11:32 AM PDT
21. # SeminarWorking Seminar: Median Spaces

Created on Sep 07, 2016 11:09 AM PDT
22. # SeminarMember Seminar: Filling inequalities for lattices in symmetric spaces

Updated on Sep 01, 2016 08:49 AM PDT
23. # SeminarDelone sets in non-abelian groups: Substitutive tilings of the hyperbolic plane

Updated on Sep 09, 2016 08:35 AM PDT
24. # SeminarWorking Seminar: Projection complexes, rotating families, and beyond

Created on Aug 31, 2016 02:36 PM PDT
25. # SeminarDelone sets in non-abelian groups: Bilipschitz equivalence of Delone sets in certain Lie groups

Updated on Sep 09, 2016 08:34 AM PDT
26. # SeminarDelone sets in non-abelian groups: What is "approximate geometric group theory”?

Updated on Sep 09, 2016 08:34 AM PDT
27. # SeminarPostdoc Seminar II: Connecting Measurable and Geometric Group Theory

Updated on Sep 02, 2016 02:10 PM PDT
28. # SeminarPostdoc Seminar I: What is a simple closed curve in a free group?: Curve graph analogues for free group automorphisms.

Updated on Sep 02, 2016 02:10 PM PDT
29. # SeminarWorking Seminar: Out(Fn) - complexes

Updated on Sep 01, 2016 01:30 PM PDT