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Colloquia & Seminars


Current Seminars

  1. 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
  2. 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

Upcoming Seminars

  1. 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
  2. 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
  3. 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
  4. 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
  5. Combinatorics Seminar: Characterization of queer supercrystals

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

     

    We provide a characterization of the crystal bases for the quantum queer superalgebra recently introduced by Grantcharov et al.. This characterization is a combination of local queer axioms generalizing Stembridge's local axioms for crystal bases for simply-laced root systems, which were recently introduced by Assaf and Oguz, with further axioms and a new graph $G$ characterizing the relations of the type $A$ components of the queer crystal. We provide a counterexample to Assaf's and Oguz' conjecture that the local queer axioms uniquely characterize the queer supercrystal. We obtain a combinatorial description of the graph $G$ on the type $A$ components by providing explicit combinatorial rules for the odd queer operators on certain highest weight elements.

    Updated on Feb 19, 2019 03:30 PM PST
  6. BGMS Seminar: On the geometry of contractions of the Moduli Space of sheaves of a K3 surface

    Location: MSRI: Simons Auditorium
    Speakers: Diletta Martinelli (University of Edinburgh)

    I will describe how recent advances have made possible to study the birational geometry of hyperkaehler varieties of K3-type using the machinery of wall-crossing and stability conditions on derived categories as developed by Tom Bridgeland. In particular Bayer and Macrì relate birational transformations of the moduli space M of sheaves of a K3 surface X to wall-crossing in the space of Bridgeland stability conditions Stab(X). I will explain how it is possible to refine their analysis to give a precise description of the geometry of the exceptional locus of any birational contraction of M.

    Updated on Feb 20, 2019 08:45 AM PST
  7. Prismatic Cohomology:

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

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

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:06 PM PST
  10. Algebraic Geometry colloquium:

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

    Location: MSRI: Baker Board Room
    Created on Feb 13, 2019 04:32 PM PST
  12. BGMS Seminar: Openness of uniform K-stability in families of Q-Fano varieties

    Location: MSRI: Simons Auditorium
    Speakers: Yuchen Liu (Yale University)

    K-stability is the algebraic notion which is supposed to characterize whether a Fano variety admits a K\"ahler-Einstein metric. One important feature of the notion of K-stability is that it is supposed to give a nicely behaved moduli space. To construct the K-moduli space of Q-Fano varieties as an algebraic space, one important step is to prove the openness of K-(semi)stable locus in families. In this talk, I will explain the proof of openness of uniform K-stability in families of Q-Fano varieties. This is achieved via showing the lower semi-continuity of delta-invariant, an interesting invariant introduced by Fujita and Odaka as a variant of Tian's alpha-invariant. This is a joint work with Harold Blum.

    Updated on Feb 20, 2019 08:46 AM PST
  13. Combinatorics Seminar:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:16 PM PST
  86. 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 5 minute talks

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

    Created on Feb 08, 2019 01:43 PM PST
  4. 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.