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Colloquia & Seminars


Current Seminars

  1. BGMS Seminar: Birational geometry in large and low characteristic

    Location: MSRI: Simons Auditorium
    Speakers: Jakub Witaszek (Institute for Advanced Study)

    The recent surge of interest in positive characteristic birational geometry provided us with a fairly good understanding of the geometry of threefolds in characteristic p>5 and surfaces in any characteristic, but, so far, little was known beyond these cases. In my talk I will explain what are the main issues with extending latest advances to lower characteristics or higher dimensions, and what are the new phenomena that needs to be understood. The talk will be partially based on a joint project with Christopher Hacon.

    Updated on Apr 11, 2019 10:58 AM PDT
  2. Elliptic Cohomology Learning Group: Spectral formal groups and orientations

    Location: MSRI: Simons Auditorium
    Speakers: Paul VanKoughnett (Purdue University)

    Following last week's discussion of p-divisible groups over commutative ring spectra, we'll define formal groups over commutative ring spectra. One key example is the Quillen formal group associated to a complex oriented ring spectrum. We'll introduce the idea of an orientation of a formal group, which amounts to an isomorphism with the associated Quillen formal group. This will allow us to state the new construction of Morava E-theory -- it is the object representing oriented deformations of a height n formal group over a perfect field.

    Updated on Apr 12, 2019 08:51 AM PDT

Upcoming Seminars

  1. DAG Seminar: The K-theory of truncated polynomial algebras and coordinate axes

    Location: MSRI: Simons Auditorium
    Speakers: Martin Speirs (University of Copenhagen)

    In this talk I will revisit the computation, originally due to Hesselholt and Madsen, of the K-theory of truncated polynomial algebras for perfect fields of positive characteristic. The original proof relied on an understanding of cyclic polytopes in order to determine the genuine equivariant homotopy type of the cyclic bar construction for a suitable monoid. Using the Nikolaus-Scholze framework for topological cyclic homology the  same result is achieved using only the homology of said cyclic bar construction, as well as the action of Connes’ operator.

    Time permitting, I will sketch how to use this method to make new computations of K-theory, in particular for the coordinate axes in affine d-space over perfect fields of positive characteristic. This extends work by Hesselholt in the case d = 2. The analogous results for fields of characteristic zero were found by Geller, Reid and Weibel in 1989. I also extend their computations to base rings which are smooth Q-algebras.

    Updated on Apr 10, 2019 09:25 AM PDT
  2. Combinatorics Seminar: Real-rooted h*-polynomials

    Location: UC Berkeley Math (Evans Hall 939)
    Speakers: Katharina Jochemko (Royal Institute of Technology (KTH))

    The Ehrhart polynomial counts the number of lattice points in integer dilates of a lattice polytope. The h*-polynomial encodes the Ehrhart polynomial in a particular basis. In this talk we give an introduction to the method of interlacing polynomials which is a powerful tool to prove that a polynomial has only real roots and present applications to h*-polynomials of zonotopes and dilated lattice polytopes.

    Updated on Apr 16, 2019 11:18 AM PDT
  3. BGMS Seminar: Birational geometry over imperfect fields

    Location: MSRI: Simons Auditorium
    Speakers: Joseph Waldron (Princeton University)

    A new feature of varieties in positive characteristic is the occurence of morphisms between smooth varieties whose fibres are all singular.  This provides an obstacle to using induction by restriction to a general fibre.  One must overcome this by working with the generic fibre instead, which is a regular but not smooth variety over an imperfect field. In this talk I will discuss progress in developing the LMMP for such varieties, and in controlling their bad behaviour in situations of interest to the LMMP such as Mori fibre spaces. This talk will be based on joint work with Zsolt Patakfalvi and works in progress with Omprokash Das and Lena Ji.

    Updated on Apr 18, 2019 12:23 PM PDT
  4. Women at MSRI lunch

    Location: MSRI: Baker Board Room
    Created on Feb 13, 2019 03:50 PM PST
  5. Future directions lectures

    Location: MSRI: Simons Auditorium
    Speakers: James McKernan (University of California, San Diego)
    Created on Mar 22, 2019 04:37 PM PDT
  6. Algebraic Geometry colloquium: p-adic comparison theorems for rigid analytic spaces.

    Location: MSRI: Simons Auditorium
    Speakers: Wieslawa Niziol (CNRS, Ecole Normale Superieure de Lyon)

    I will discuss what we know about the relation between p-adic etale cohomology and de Rham cohomology of rigid analytic varieties, where, in general, both cohomology groups are infinite dimensional. This is based on a joint work with Pierre Colmez and Gabriel Dospinescu.

    Updated on Apr 18, 2019 09:18 AM PDT
  7. 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
  8. Graduate Student Seminar

    Location: MSRI: Baker Board Room
    Created on Feb 22, 2019 01:38 PM PST
  9. 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
  10. Combinatorics Seminar:

    Location: UC Berkeley Math (Evans Hall 939)
    Created on Nov 06, 2018 01:41 PM PST
  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. DAG Learning Seminar:

    Location: MSRI: Simons Auditorium
    Created on Mar 06, 2019 01:27 PM PST
  16. BGMS Seminar:

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

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

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

    Location: MSRI: Baker Board Room
    Speakers: David Morrison (University of California, Santa Barbara)
    Created on Apr 17, 2019 03:45 PM PDT
  20. BGMS Seminar:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    Created on Mar 12, 2019 09:16 AM PDT
  3. Seminar Women at MSRI lunch

    Created on Feb 13, 2019 03:50 PM PST
  4. Seminar DAG Seminar: TBA

    Updated on Mar 29, 2019 10:59 AM PDT
There are more then 30 past seminars. Please go to Past seminars to see all past seminars.