Logo

Mathematical Sciences Research Institute

Home > Scientific > Colloquia & Seminars > All Colloquia & Seminars

All Colloquia & Seminars

  1. Number Theory Seminar: On some Tate cycles on Shimura varieties

    Location: 740 Evans Hall
    Speakers: Xinwen Zhu (California Institute of Technology)

    This is based on a joint work with Liang Xiao. I will first describe certain conjectural Tate classes in the middle dimensional etale cohomology of many Shimura varieties over finite fields (starting from Hilbert and Picard modular surfaces at inert primes). According to the Tate conjecture, there should exist corresponding algebraic cycles. Surprisingly, we find that these cycles are provided by the supersingular (or more precisely basic) loci of these Shimura varieties. I will explain how to understand the situation using the geometric Satake in mixed characteristic.

    Updated on Oct 17, 2014 10:27 AM PDT
  2. NGM Research Seminar: The spectral halo

    Location: MSRI: Simons Auditorium
    Speakers: vincent pilloni (École Normale Supérieure de Lyon)

    The spectral variety is the zero locus of the characteristic series of the U_p operator. Coleman conjectured that it should look like a halo near the boundary.

    Updated on Oct 09, 2014 02:33 PM PDT
  3. NGM Research Seminar: Safe chains of automorphic congruences and new cases of Langlands functoriality

    Location: MSRI: Simons Auditorium
    Speakers: Luis Dieulefait (University of Barcelona)

    we will describe the main strategies in our proof of cases of base change, symmetric powers and tensor product functoriality (the tensor product result is joint work with S. Arias de Reyna and T. Gee).

    The main tools are the theory of congruences between automorphic forms and automorphy lifting theorems a la Taylor-Wiles.

    Updated on Oct 09, 2014 02:33 PM PDT
  1. NGM Pizza Seminar: Level raising mod 2 and 2-Selmer groups

    Location: MSRI: Simons Auditorium
    Speakers: Bao Le Hung (Harvard University)

    We discuss a level raising result mod p=2 for weight 2 modular forms, where some extra phenomena happens compared to the p odd case. We then apply this to study 2-Selmer groups of modular forms in level raising families.

    This is joint work with Chao Li.

    Updated on Oct 17, 2014 09:27 AM PDT
  2. GRT Pizza Seminar

    Location: MSRI: Simons Auditorium
    Updated on Sep 03, 2014 03:46 PM PDT
  3. MSRI Evans Talk: Representation theory and arithmetic invariants

    Location: 60 Evans Hall, UC Berkeley
    Speakers: Atsushi Ichino (Kyoto University)

    The local Langlands correspondence (conjecture) relates (infinite-dimensional) representations of p-adic reductive groups with (finite-dimensional) Galois representations. This can be viewed in many ways, and from the viewpoint of the representation theory, this gives us a "classification" of representations of p-adic reductive groups by viewing arithmetic objects as "simpler" parameters. Then it will be natural to study representation-theoretic problems in terms of arithmetic invariants. In this talk, we explain some cases which can be answered in this setup: the Gan-Gross-Prasad conjecture (a restriction problem) and formal degrees (a generalization of dimensions).

    Updated on Oct 16, 2014 09:22 AM PDT
  4. Joint Seminar

    Location: MSRI: Simons Auditorium
    Created on Sep 02, 2014 04:05 PM PDT
  5. Working Group on "Modular sheaves and modular representations"

    Location: MSRI: Simons Auditorium

    George Melvin: Equivariant Sheaves, part II

    Peter Fiebig: Overview talk: Parity sheaves, moment graphs and representations

    Created on Sep 12, 2014 01:49 PM PDT
  6. L-Groups Seminar

    Location: MSRI: Simons Auditorium
    Created on Oct 13, 2014 04:43 PM PDT
  7. GRT Research Seminar

    Location: MSRI: Simons Auditorium
    Created on Sep 03, 2014 11:53 AM PDT
  8. Number Theory Seminar

    Location: 740 Evans Hall
    Created on Sep 12, 2014 01:13 PM PDT
  9. NGM Research Seminar: Iterate extensions, Coleman power series and the field of norms

    Location: MSRI: Simons Auditorium
    Speakers: Laurent Berger (École Normale Supérieure de Lyon)

    In the classical theory of (phi,Gamma)-modules, Gamma is the Galois group of the cyclotomic extension. For which other p-adic Lie extensions, with Galois group Gamma, can we have a theory of (phi,Gamma)-modules? I will discuss this question, give some partial results and formulate a conjecture.

    Updated on Oct 21, 2014 03:22 PM PDT
  10. NGM Research Seminar: Functorial local functoriality

    Location: MSRI: Simons Auditorium
    Speakers: Jean-Francois Dat (Université de Paris VI (Pierre et Marie Curie))

    A basic problem when studying the category of l-adic (rational or integral) smooth representations of a p-adic group is to decompose it as a direct product of subcategories and show that each factor is equivalent to some previously known and supposedly simpler other abelian category.

    In this talk we investigate what Langlands' functoriality principle can teach us on this problem, by making precise the following rough guess : the category of rational (resp integral) representations should have a decomposition indexed by L-parameters with source the inertia group (resp its pro-prime-to-l radical) and, under special circumstances, a morphism of L-group should "induce" an equivalence between categories associated to matching parameters.

    Two techniques have already been succesfully used to produce equivalences of this kind : types theory (quite indirect and bound to rational coefficients at the moment) and non abelian Lubin-Tate theory (very specific). We will introduce a third technique, adapted to tame parameters,  which roughly consists in gluing the cohomology of suitable Deligne-Lusztig varieties along a building. The upshot is that any tame integral block of a GLn is equivalent to the unipotent integral block of a suitable product of GLm's over extension fields.

    Updated on Oct 21, 2014 03:23 PM PDT
  11. NGM Pizza Seminar

    Location: MSRI: Simons Auditorium
    Updated on Sep 03, 2014 03:48 PM PDT
  12. GRT Pizza Seminar

    Location: MSRI: Simons Auditorium
    Speakers: Alexis Bouthier (Université Paris-Sud (Orsay))
    Updated on Sep 03, 2014 03:48 PM PDT
  13. Grad Student Seminar

    Location: MSRI: Simons Auditorium
    Updated on Oct 10, 2014 04:35 PM PDT
  14. Colloquium: On the mod p Langlands program for GLn

    Location: MSRI: Simons Auditorium
    Speakers: Christophe Breuil (Centre National de la Recherche Scientifique (CNRS))

    Let K be a finite extension of Qp. It is known for some time that one cannot expect a bijection between smooth irreducible admissible representations of GLn(K) and smooth n-dimensional representations of Gal(Kbar/K), both over Fpbar. However, one can still hope for a ``good understanding'' of the representations of GLn(K) occuring as Hecke Eigenspaces of mod p automorphic forms (for, say, compact unitary groups).

    When K is unramified, I will present some conjectures on the generic structure of these GLn(K)-representations, and the way this structure is related to the underlying Gal(Kbar/K)-representation. Then I will give some fragmentary evidence (due to many people) which support these conjectures.

    This is joint work (in progress) with Florian Herzig and Benjamin Schraen.

    Updated on Oct 08, 2014 11:44 AM PDT
  15. Joint Seminar

    Location: MSRI: Simons Auditorium
    Created on Sep 02, 2014 04:23 PM PDT
  16. GRT Research Seminar

    Location: MSRI: Simons Auditorium
    Created on Sep 03, 2014 12:05 PM PDT
  17. Number Theory Seminar

    Location: 740 Evans Hall
    Created on Sep 12, 2014 01:14 PM PDT
  18. NGM Research Seminar

    Location: MSRI: Simons Auditorium
    Speakers: Ariane Mézard (L'Institut de Mathématiques de Jussieu)
    Updated on Oct 01, 2014 11:46 AM PDT
  19. NGM Research Seminar

    Location: MSRI: Simons Auditorium
    Speakers: Colette Moeglin (Centre National de la Recherche Scientifique (CNRS))
    Updated on Oct 01, 2014 11:46 AM PDT
  20. NGM Pizza Seminar

    Location: MSRI: Simons Auditorium
    Updated on Sep 03, 2014 03:49 PM PDT
  21. GRT Pizza Seminar

    Location: MSRI: Simons Auditorium
    Speakers: Dragos Fratila (Université de Paris VII (Denis Diderot))
    Updated on Sep 03, 2014 03:49 PM PDT
  22. Grad Student Seminar

    Location: MSRI: Simons Auditorium
    Updated on Oct 10, 2014 04:41 PM PDT
  23. Joint Seminar

    Location: MSRI: Simons Auditorium
    Created on Sep 22, 2014 03:11 PM PDT
  24. GRT Research Seminar

    Location: MSRI: Simons Auditorium
    Created on Sep 03, 2014 12:12 PM PDT
  25. Number Theory Seminar

    Location: 740 Evans Hall
    Created on Sep 12, 2014 01:25 PM PDT
  26. NGM Research Seminar

    Location: MSRI: Simons Auditorium
    Speakers: Kiran Kedlaya (University of California, San Diego)
    Updated on Oct 01, 2014 11:48 AM PDT
  27. NGM Research Seminar

    Location: MSRI: Simons Auditorium
    Speakers: Wieslawa Niziol (Centre National de la Recherche Scientifique (CNRS))
    Updated on Oct 01, 2014 12:05 PM PDT
  28. NGM Pizza Seminar

    Location: MSRI: Simons Auditorium
    Updated on Sep 03, 2014 03:51 PM PDT
  29. GRT Pizza Seminar

    Location: MSRI: Simons Auditorium
    Speakers: Galyna Dobrovolska (Columbia University)
    Updated on Oct 20, 2014 09:48 AM PDT
  30. Grad Student Seminar

    Location: MSRI: Simons Auditorium
    Updated on Oct 10, 2014 04:42 PM PDT
  31. Number Theory Seminar

    Location: 740 Evans Hall
    Created on Sep 12, 2014 01:26 PM PDT
  32. NGM Research Seminar

    Location: MSRI: Baker Board Room
    Updated on Oct 01, 2014 12:06 PM PDT
  33. NGM Research Seminar

    Location: MSRI: Baker Board Room
    Updated on Oct 01, 2014 12:05 PM PDT
  34. NGM Research Seminar

    Location: MSRI: Simons Auditorium
    Updated on Oct 07, 2014 03:10 PM PDT
  35. NGM Research Seminar

    Location: MSRI: Simons Auditorium
    Updated on Oct 07, 2014 03:10 PM PDT
  36. Colloquium

    Location: MSRI: Simons Auditorium
    Created on Sep 02, 2014 12:55 PM PDT
  37. MSRI Evans Talk

    Location: 60 Evans Hall, UC Berkeley
    Speakers: Ana Caraiani (Princeton University)
    Updated on Oct 22, 2014 02:59 PM PDT
  38. Joint Seminar

    Location: MSRI: Simons Auditorium
    Created on Sep 03, 2014 09:25 AM PDT
  39. GRT Research Seminar

    Location: MSRI: Simons Auditorium
    Created on Sep 03, 2014 12:26 PM PDT
  40. Number Theory Seminar

    Location: 740 Evans Hall
    Created on Sep 12, 2014 01:29 PM PDT
  41. MSRI Evans Talk

    Location: 60 Evans Hall, UC Berkeley
    Speakers: Pierre Colmez (L'Institut de Mathématiques de Jussieu)
    Created on Aug 08, 2014 10:49 AM PDT
  42. GRT Research Seminar

    Location: MSRI: Baker Board Room
    Created on Sep 22, 2014 01:27 PM PDT
  43. Number Theory Seminar

    Location: 740 Evans Hall
    Created on Sep 12, 2014 01:31 PM PDT
  44. Colloquium

    Location: MSRI: Simons Auditorium
    Created on Sep 02, 2014 12:56 PM PDT
  45. Joint Seminar

    Location: MSRI: Simons Auditorium
    Created on Sep 03, 2014 10:27 AM PDT
  46. GRT Research Seminar

    Location: MSRI: Simons Auditorium
    Created on Sep 03, 2014 12:39 PM PDT
  47. Number Theory Seminar

    Location: 740 Evans Hall
    Created on Sep 12, 2014 01:33 PM PDT
  48. NGM Research Seminar

    Location: MSRI: Simons Auditorium
    Updated on Oct 01, 2014 12:07 PM PDT
  49. NGM Research Seminar

    Location: MSRI: Simons Auditorium
    Updated on Oct 01, 2014 12:07 PM PDT
  50. GRT Pizza Seminar

    Location: MSRI: Simons Auditorium
    Updated on Sep 03, 2014 04:22 PM PDT
  51. Grad Student Seminar

    Location: MSRI: Simons Auditorium
    Updated on Oct 10, 2014 04:43 PM PDT
  52. Colloquium

    Location: MSRI: Simons Auditorium
    Created on Sep 02, 2014 12:58 PM PDT
  53. GRT Research Seminar

    Location: MSRI: Simons Auditorium
    Created on Sep 03, 2014 12:46 PM PDT
  54. Number Theory Seminar

    Location: 740 Evans Hall
    Created on Sep 12, 2014 01:34 PM PDT

Past Seminars

seminar
  1. Seminar Colloquium

    Created on Sep 02, 2014 12:49 PM PDT
  2. Seminar GRT Pizza Seminar

    Updated on Sep 03, 2014 03:44 PM PDT
There are more then 30 past seminars. Please go to Past seminars to see all past seminars.