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All Colloquia & Seminars

Current Seminars

  1. BGMS Seminar: Non-commutative deformations, perverse coherent sheaves and semi-orthogonal decompositions.

    Location: MSRI: Simons Auditorium
    Speakers: Yujiro Kawamata (University of Tokyo)

    We consider deformations of objects over non-commutative rings, which are more natural than commutative ones in some cases. As examples, we treat deformations of perverse coherent sheaves, and semi-orthogonal decompositions of derived categories corresponding to singularities.

    Updated on Apr 18, 2019 12:24 PM PDT

Upcoming Seminars

  1. Graduate Student Seminar: (Logarithmic) Chow-to-Hodge cycle maps

    Location: MSRI: Baker Board Room
    Speakers: Charles Godfrey (University of Washington)

    The cycle map from Chow groups to Hodge cohomology has a long and illustrious history. This talk will concern a variant adapted to log-smooth pairs, mapping out of the “log Chow groups” and taking values in log Hodge cohomology (using differential forms with log poles).

    Updated on Apr 19, 2019 01:48 PM PDT
  2. DAG Seminar: Link homology and Hilbert schemes (University of Bonn)

    Location: MSRI: Simons Auditorium
    Speakers: Tina Kanstrup (Aarhus University)

    One way to investigate whether two links are equivalent is to use link invariants. One of the most famous ones is Khovanov-Rozansky triply graded homology. It is defined algebraically and is notoriously hard to compute. Gorsky, Negut and Rasmussen conjectured that it can be calculated as cohomology of certain coherent sheaves on the flag Hilbert scheme. A link invariant of a similar nature has been constructed by Oblomkov and Rozansky in terms of matrix factorizations. The aim of this joint work in progress with Roman Bezrukavnikov, Alexei Oblomkov and Andrei Negut is to prove the conjecture by reformulating Oblomkov-Rozansky using work of Ben-Zvi and Nadler et al. together with work of Arkhipov and Kanstrup

    Updated on Apr 17, 2019 10:25 AM PDT
  3. Combinatorics Seminar: Representations of Hecke algebras and lattice-path counting

    Location: UC Berkeley Math (Evans Hall 939)
    Speakers: Jose Simental (University of California, Davis)

    The branching rule for representations of the symmetric group tells us that, over a field of characteristic zero, the dimension of the irreducible representation indexed by a partition \lambda is given by the number of directed lattice paths from \lambda (though of as an integer vector) to the origin that stay inside the dominant Weyl chamber. Over a field of positive characteristic (or for Hecke algebras at roots of unity) this is no longer true, and the dimension of an irreducible is in general unknown. We will see, however, that there is a nice class of irreducibles (called calibrated, completely splittable or tame by different authors) whose dimension is given by the number of lattice paths to the origin that stay within a dilation of the fundamental alcove. Then we will provide an explicit resolution of these modules by Specht modules, whose dimensions are as in the characteristic zero case. This gives a representation-theoretic interpretation of combinatorial results of Filasetta, Krattenthaler and others. Based on joint work with C. Bowman and E. Norton.

    Updated on Apr 25, 2019 04:37 PM PDT
  4. BGMS Seminar: Polynomial Pell equations and undecidable questions in algebraic geometry

    Location: MSRI: Simons Auditorium
    Speakers: János Kollár (Princeton University)

    Abel initiated the  study of  the  polynomial  Pell equation $x^2-g(z)y^2=1$, where  $g(z)$ is a fixed polynomial. We are looking for solutions where $x, y, z$ are also polynomials in a variable  $t$. Then we use these results to exhibit some new  undecidable questions in complex algebraic geometry.

    Updated on Apr 23, 2019 02:23 PM PDT
  5. Women at MSRI lunch

    Location: MSRI: Baker Board Room
    Created on Feb 13, 2019 03:50 PM PST
  6. DAG Seminar: TBA

    Location: MSRI: Simons Auditorium
    Speakers: Tasos Moulinos (Centre National de la Recherche Scientifique (CNRS))
    Updated on Apr 24, 2019 03:29 PM PDT
  7. BGMS Seminar: Top weight cohomology of M_{g,n}

    Location: MSRI: Simons Auditorium
    Speakers: Sam Payne (University of Texas)

    I will discuss applications of tropical geometry to the cohomology of moduli spaces of curves, with and without marked points.  Based on joint work with Melody Chan, Carel Faber, and Soren Galatius.

    Updated on Apr 23, 2019 02:23 PM PDT
  8. Graduate Student Seminar: A Simpson Correspondence for Abelian Varieties in Characteristic p > 0.

    Location: MSRI: Baker Board Room
    Speakers: Yun Hao (Freie Universität Berlin)

    In the early 90s, Simpson established an equivalence between the category of local systems, and that of the semi-stable Higgs bundles whose Chern class is zero, over a smooth projective variety over the complex numbers. Such a correspondence between Higgs bundles and local systems is sometimes called the Simpson correspondence. In positive characteristic, an analogue of this result was first discovered by Ogus and Vologodsky in 2007, for bundles with nilpotent connections and Higgs fields. Later on, Groechenig, Chen and Zhu also established a full correspondence without the nilpotence conditions, for bundles over curves. In this talk, following the approach of Groechenig,  I will show that a full correspondence still holds for bundles over abelian varieties.

    Updated on Apr 25, 2019 04:43 PM PDT
  9. DAG Seminar: Picard groups in chromatic homotopy theory

    Location: MSRI: Simons Auditorium
    Speakers: Irina Bobkova (Institute for Advanced Study)

    The group of invertible objects in a symmetric monoidal category is a basic invariant of the category. The Picard group of the category of spectra is known to consist only of the sphere spectrum and its suspensions. In chromatic homotopy theory we consider the categories of spectra localized with respect to the Morava K-theories K(n) (where we first fix a prime p), and these have much richer Picard groups. I will first describe some classical results about these groups. Then I will talk about current work on understanding the Picard group of the K(2)-local category at p=2. This is based on joint  
    work with Beaudry, Goerss and Henn.

    Updated on Apr 24, 2019 03:41 PM PDT
  10. AG Colloquium

    Location: MSRI: Baker Board Room
    Speakers: Jacob Tsimerman (Harvard University)
    Created on Apr 17, 2019 03:45 PM PDT
  11. BGMS Seminar:

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 12:19 PM PST
  12. Prismatic Cohomology:

    Location: MSRI: Simons Auditorium
    Created on Feb 12, 2019 04:53 PM PST
  13. Women at MSRI lunch

    Location: MSRI: Baker Board Room
    Created on Feb 13, 2019 03:50 PM PST
  14. DAG Seminar:

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:06 PM PST
  15. Future directions lectures

    Location: MSRI: Simons Auditorium
    Speakers: Chenyang Xu (Massachusetts Institute of Technology)
    Updated on Mar 22, 2019 04:43 PM PDT
  16. DAG Learning Seminar:

    Location: MSRI: Simons Auditorium
    Created on Mar 06, 2019 01:27 PM PST
  17. Future directions lectures

    Location: MSRI: Simons Auditorium
    Speakers: Burt Totaro (University of California, Los Angeles)
    Updated on Mar 22, 2019 04:44 PM PDT
  18. BGMS Seminar:

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:16 PM PST
  19. Graduate Student Seminar

    Location: MSRI: Baker Board Room
    Created on Feb 22, 2019 01:38 PM PST
  20. DAG Seminar:

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:19 PM PST
  21. BGMS Seminar:

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 12:19 PM PST
  22. Prismatic Cohomology:

    Location: MSRI: Simons Auditorium
    Created on Feb 12, 2019 04:53 PM PST
  23. Women at MSRI lunch

    Location: MSRI: Baker Board Room
    Created on Feb 13, 2019 03:50 PM PST
  24. DAG Seminar:

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:06 PM PST
  25. DAG Learning Seminar:

    Location: MSRI: Simons Auditorium
    Created on Mar 06, 2019 01:27 PM PST
  26. Chromatic DAG Seminar:

    Location: MSRI: Commons Room
    Created on Mar 12, 2019 09:16 AM PDT
  27. BGMS Seminar:

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:16 PM PST
  28. Graduate Student Seminar

    Location: MSRI: Baker Board Room
    Created on Feb 22, 2019 01:38 PM PST
  29. DAG Seminar:

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:19 PM PST

Past Seminars

  1. Seminar Women at MSRI lunch

    Created on Feb 13, 2019 03:50 PM PST
  2. Seminar Women at MSRI lunch

    Created on Feb 13, 2019 03:50 PM PST
There are more then 30 past seminars. Please go to Past seminars to see all past seminars.