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Colloquia & Seminars


Current Seminars

  1. DAG Seminar: Spaces of Algebraic Cobordism and Derived Algebraic Geometry

    Location: MSRI: Simons Auditorium
    Speakers: Elden Elmanto (Harvard University)

    In previous joint work with Hoyois, Khan, Sosnilo and Yakerson we obtained (up to group completion) a geometric description of the $0$-th space of the motivic sphere spectrum in terms of a certain torsor over an open subscheme of the Hilbert scheme of points in infinite dimensional affine space. The base scheme is smooth and turns out to describe the $0$-th space of Voevodsky's algebraic cobordism spectrum. The problem of describing the $n$-th space is currently in progress and the description involves the moduli of derived schemes of virtual dimension $-n$. 

    In this talk, I will discuss these results and some of its corollaries, especially those concerning generation results on Chow groups of smooth complex varieties. A gentle introduction to motivic homotopy theory and previous work will be included. 

    All this is joint with Hoyois, Khan, Sosnilo and Yakerson.

    Updated on Feb 08, 2019 11:31 AM PST

Upcoming Seminars

  1. Prismatic Cohomology: Introduction to prismatic cohomology

    Location: MSRI: Baker Board Room
    Speakers: Bhargav Bhatt (University of Michigan)

    Prismatic cohomology is a recently discovered mechanism for producing certain 1-parameter deformations of de Rham cohomology in arithmetic geometry. In this talk, I'll give the examples motivating this theory, give an outline of its construction, and mention a couple of applications.

    Updated on Feb 14, 2019 09:15 AM PST
  2. Women at MSRI lunch

    Location: MSRI: Baker Board Room
    Created on Feb 13, 2019 03:50 PM PST
  3. DAG Seminar: Combinatorics in the ring of big Witt vectors

    Location: MSRI: Simons Auditorium
    Speakers: Sean Howe (Stanford University)

    Combinatorial principles like inclusion-exclusion can be obtained by decategorifying natural structures on the category of finite sets, whose Grothendieck ring is the ring of integers, Z. In this talk, we explain what happens when similar structures are decategorified from the category of almost-finite cyclic sets, whose Grothendieck ring is the big Witt ring, W(Z). A natural example of an almost-finite cyclic set is the set of \overline{Fq}-points of an algebraic variety over Fq, and the corresponding element in W(Z) is the zeta function of the variety; using this, we explain how combinatorics in the ring of big Witt vectors can be applied to prove theorems in arithmetic and motivic statistics.

    Updated on Feb 14, 2019 09:30 AM PST
  4. Bowen Lecture Series -1- Symmetries of polynomial equations.

    Location: UC Berkeley - Banatao Auditorium, Sutardja Dai Hall
    Speakers: James McKernan (University of California, San Diego)

    The symmetries of systems of polynomial equations can be be understood in terms of the geometry of the variety of zeroes (or solution set) of the polynomials. Roughly speaking, there are 3 kinds of geometries corresponding to positive, zero and negative curvature giving rise to 3 different kinds of symmetry groups. In this lecture, I will discuss recent advances in algebraic geometry that lead to very precise results on the structure of these symmetry groups.

    Updated on Feb 11, 2019 10:18 AM PST
  5. BGMS Seminar: The integral Hodge conjecture for curve classes

    Location: MSRI: Simons Auditorium
    Speakers: John Ottem (University of Oslo)

    The integral Hodge conjecture predicts which integral cohomology classes on a smooth complex projective variety can be represented by linear combinations of complex subvarieties. This statement is known to be false in general, as shown first by Atiyah and Hirzebruch. I'll give a short introduction to this conjecture, and present some new counterexamples. This is joint work with Olivier Benoist.

    Created on Feb 14, 2019 02:33 PM PST
  6. Bowen Lecture Series -2- On the birational classification of algebraic varieties.

    Location: UC Berkeley - Banatao Auditorium, Sutardja Dai Hall
    Speakers: Christopher Hacon (University of Utah)

    Algebraic varieties are geometric objects defined by polynomial equations. The minimal model program (MMP) is an ambitious program that aims to classify algebraic varieties. According to the MMP, there are 3 building blocks: Fano varieties, Calabi-Yau varieties and varieties of general type which are higher dimensional analogs of Riemann Surfaces of genus 0,1 or at least 2 respectively. In this talk I will recall the general features of the MMP and discuss recent advances in our understanding of Fano varieties and varieties of general type.

    Updated on Feb 11, 2019 10:17 AM PST
  7. BGMS Seminar: Moduli of surfaces in P^3

    Location: MSRI: Simons Auditorium
    Speakers: Kristin DeVleming (University of California, San Diego)

    We will discuss a stable pair compactification of the moduli space of degree d surfaces in P^3.  These compactifications, introduced by Koll\'ar and Shepherd-Barron arising from ideas in the Minimal Model Program, are generally difficult to describe explicitly.  Motivated by work of Hacking, who obtained an explicit modular compactification for plane curves, we consider a surface S in P^3 as a pair (P^3, S).  Then, using a particular enlarged class of these pairs, we can compactify the moduli space of such surfaces.  Using this framework, for surfaces of odd degree d, we obtain a rough classification of the singular objects on the boundary of this moduli space and will discuss some divisorial components of the boundary.  We give a more detailed description for quintic surfaces. 

    Updated on Feb 14, 2019 09:24 AM PST
  8. Bowen Lecture Series -3- Birational geometry in characteristic p>0.

    Location: UC Berkeley - 60 Evans Hall
    Speakers: Christopher Hacon (University of Utah)

    After recent spectacular progress in the classification of varieties over an algebraic closed field of characteristic 0 (e.g. the solution set of a system of polynomial equations defined by p1,...,prp1,...,pr in C[x1,...,xn]C[x1,...,xn]) it is natural to try and understand the geometry of varieties defined over an algebraically closed field of characteristic p>0p>0. Many technical difficulties arise in this context. Nevertheless, there has been much progress recently. In particular, the MMP was established for 3-folds in characteristic p>5p>5 by work of Birkar, Hacon, Xu and others. In this talk, we will explain some of the challenges and the recent progress in this active area of research.

    Updated on Feb 11, 2019 10:16 AM PST
  9. DAG Seminar: Motivic cohomology and the derived Hecke algebra for dihedral weight one forms

    Location: MSRI: Simons Auditorium
    Speakers: Michael Harris (Columbia University)

    This is a report on joint work in progress with Darmon, Rotger, and Venkatesh.    In a series of papers, Venkatesh and his collaborators have proposed a conjectural framework that incorporates the action of motivic cohomology groups on the cohomology of locally symmetric spaces.  The simplest case concerns the cohomology of the special fiber in characteristic p of the modular curve with coefficients in the sheaf of weight 1 forms. There the conjecture relates the action of derived Hecke operators, which only exist over coefficient rings in positive characteristic, to the (discrete) logarithms of certain units in the number fields cut out by two-dimensional complex representations of the absolute Galois group of Q.  Our main result is a proof of this conjecture as it pertains to weight one forms whose associated Galois representations are induced from Dirichlet characters of quadratic fields.  The proof is based on classical constructions in the theory of modular forms. If time permits, there will be a discussion of how Venkatesh's conjectures might fit into a (highly speculative) derived version of the Langlands program.

    Updated on Feb 14, 2019 09:34 AM PST
  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: Baker Board Room
    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. Algebraic Geometry colloquium:

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:14 PM PST
  16. Reading Group on Hodge Theory

    Location: MSRI: Baker Board Room
    Created on Feb 13, 2019 04:32 PM PST
  17. BGMS Seminar:

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:16 PM PST
  18. Combinatorics Seminar:

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

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

    Location: MSRI: Baker Board Room
    Created on Feb 12, 2019 04:53 PM PST
  21. Women at MSRI lunch

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

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:06 PM PST
  23. Combinatorics Seminar:

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

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

    Location: MSRI: Baker Board Room
    Created on Feb 12, 2019 04:53 PM PST
  26. Women at MSRI lunch

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

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:06 PM PST
  28. Reading Group on Hodge Theory

    Location: MSRI: Baker Board Room
    Created on Feb 13, 2019 04:32 PM PST
  29. BGMS Seminar:

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:16 PM PST
  30. DAG Seminar:

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

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

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

    Location: MSRI: Baker Board Room
    Created on Feb 12, 2019 04:53 PM PST
  34. Women at MSRI lunch

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

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:06 PM PST
  36. Reading Group on Hodge Theory

    Location: MSRI: Baker Board Room
    Created on Feb 13, 2019 04:32 PM PST
  37. BGMS Seminar:

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:16 PM PST
  38. DAG Seminar:

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

    Location: UC Berkeley Math (Evans Hall 939)
    Created on Nov 06, 2018 01:41 PM PST
  40. Reading Group on Hodge Theory

    Location: MSRI: Baker Board Room
    Created on Feb 13, 2019 04:32 PM PST
  41. Combinatorics Seminar:

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

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

    Location: MSRI: Baker Board Room
    Created on Feb 12, 2019 04:53 PM PST
  44. Women at MSRI lunch

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

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:06 PM PST
  46. Reading Group on Hodge Theory

    Location: MSRI: Baker Board Room
    Created on Feb 13, 2019 04:32 PM PST
  47. BGMS Seminar:

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:16 PM PST
  48. DAG Seminar:

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

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

    Location: MSRI: Baker Board Room
    Created on Jan 29, 2019 12:19 PM PST
  51. Prismatic Cohomology:

    Location: MSRI: Baker Board Room
    Created on Feb 12, 2019 04:53 PM PST
  52. Women at MSRI lunch

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

    Location: MSRI: Baker Board Room
    Created on Feb 13, 2019 04:00 PM PST
  54. Reading Group on Hodge Theory

    Location: MSRI: Baker Board Room
    Created on Feb 13, 2019 04:32 PM PST
  55. BGMS Seminar:

    Location: MSRI: Baker Board Room
    Created on Jan 29, 2019 01:16 PM PST
  56. DAG Seminar:

    Location: MSRI: Baker Board Room
    Created on Jan 29, 2019 01:19 PM PST
  57. Combinatorics Seminar:

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

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

    Location: MSRI: Baker Board Room
    Created on Feb 12, 2019 04:53 PM PST
  60. Women at MSRI lunch

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

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:06 PM PST
  62. Reading Group on Hodge Theory

    Location: MSRI: Baker Board Room
    Created on Feb 13, 2019 04:32 PM PST
  63. BGMS Seminar:

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:16 PM PST
  64. DAG Seminar:

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

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

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

    Location: MSRI: Baker Board Room
    Created on Feb 12, 2019 04:53 PM PST
  68. Women at MSRI lunch

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

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:06 PM PST
  70. Reading Group on Hodge Theory

    Location: MSRI: Baker Board Room
    Created on Feb 13, 2019 04:32 PM PST
  71. BGMS Seminar:

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:16 PM PST
  72. DAG Seminar:

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

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

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

    Location: MSRI: Baker Board Room
    Created on Feb 12, 2019 04:53 PM PST
  76. Women at MSRI lunch

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

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:06 PM PST
  78. BGMS Seminar:

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:16 PM PST
  79. DAG Seminar:

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

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

    Location: MSRI: Baker Board Room
    Created on Feb 12, 2019 04:53 PM PST
  82. Women at MSRI lunch

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

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:06 PM PST
  84. BGMS Seminar:

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:16 PM PST
  85. DAG Seminar:

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

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

    Location: MSRI: Baker Board Room
    Created on Feb 12, 2019 04:53 PM PST
  88. Women at MSRI lunch

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

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:06 PM PST
  90. BGMS Seminar:

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:16 PM PST
  91. DAG Seminar:

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

Past Seminars

  1. Seminar 5 minute talks

    Created on Feb 08, 2019 01:43 PM PST
  2. Seminar 5 minute talks

    Created on Feb 08, 2019 01:43 PM PST
  3. Seminar Arnold Diffusion

    Created on Dec 05, 2018 03:17 PM PST
There are more then 30 past seminars. Please go to Past seminars to see all past seminars.