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Current Colloquia & Seminars

  1. NGM Pizza Seminar: Control theorems for overconvergent automorphic forms

    Location: MSRI: Simons Auditorium
    Speakers: Christian Johansson (University of Oxford)

    A theorem of Coleman asserts that if f is an overconvergent U_p-eigenform of weight k>1 such that the valuation of its U_p-eigenvalue is <k-1, then f is classical modular form. In this talk I will discuss variations of Coleman's proof of this theorem, with an eye towards ideas that generalize to higher-dimensional Shimura varieties. Part of this is joint work with Vincent Pilloni.

    Updated on Oct 23, 2014 09:18 AM PDT
  2. GRT Pizza Seminar: Hitchin-Frenkel-NgĂ´'s fibration and Vinberg semigroup

    Location: MSRI: Simons Auditorium
    Speakers: Alexis Bouthier (Université Paris-Sud (Orsay))

    In this talk, we will explain the link between the Vinberg's semigroup and the Hitchin group like fibration, that was introduced by Frenkel and Ngô for SL_{2}. This fibration appears as a nice object to get orbital integrals for the spherical Hecke algebra and a good understanding of the orbital side of the trace formula.

    Updated on Oct 24, 2014 02:40 PM PDT
  3. Grad Student Seminar: Perverse sheaves and nearby cycles

    Location: MSRI: Simons Auditorium
    Speakers: Quoc Ho (University of Chicago)

    I will finish the discussion of perverse sheaves from last time, talk about G-equivariant perverse sheaves and about nearby cycles.

    Updated on Oct 24, 2014 02:41 PM PDT