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Upcoming Colloquia & Seminars

  1. 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
  2. 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
  3. Prismatic Cohomology: Introduction to δ-rings

    Location: MSRI: Baker Board Room
    Speakers: Sam Raskin (University of Texas, Austin)

    As was discussed in Bhargav's talk last week, δ-rings play a fundamental role in the theory of prismatic cohomology. We will reintroduce them and discuss their basic properties.
     

    Updated on Feb 21, 2019 12:07 PM PST
  4. Women at MSRI lunch

    Location: MSRI: Baker Board Room
    Created on Feb 13, 2019 03:50 PM PST
  5. DAG Seminar: 2-Segal spaces and algebraic K-theory

    Location: MSRI: Simons Auditorium
    Speakers: Julie Bergner (University of Virginia)

    The structure of a 2-Segal space encodes data like that of a category, but for which composition need not always exist or be unique, yet is still associative.  It was shown by Dyckerhoff and Kapranov, and independently by G\'alvez-Carrillo, Kock, and Tonks, that applying Waldhausen's S-construction to an exact category results in a 2-Segal space.  In joint work with Osorno, Ozornova, Rovelli, and Scheimbauer, we expand the input of this construction in such a way that the S-construction defines an equivalence of homotopy theories, as well as recovers other known generalizations.  In work in progress with Zakharevich, we show that this general input has a close relationship with the CGW categories of Campbell and Zakharevich, which are also designed to be a very general context in which algebraic K-theory constructions can be made.

    Updated on Feb 22, 2019 12:06 PM PST
  6. Algebraic Geometry colloquium: Topology and arithmetic statistics

    Location: MSRI: Simons Auditorium
    Speakers: Craig Westerland (University of Minnesota Twin Cities)

    There are many questions in number theory and arithmetic geometry of the sort “Does the following situation ever occur?” For instance, the inverse Galois problem asks whether every finite group occurs as the Galois group of an extension of the rationals. Similarly, one might ask whether one expects the rank of elliptic curves to be unbounded. 

    Arithmetic statistics, broadly speaking, pursues the more quantitative question of how often such situations occur. The extension of the inverse Galois problem to this setting is a conjecture of Malle’s, which predicts an asymptotic formula for the number of occurrences of a given finite group G as the Galois group of a number field, as a function of the discriminant.  There are analogous statistical conjectures regarding the distribution of class groups ordered by discriminant (e.g., the Cohen-Lenstra heuristics), or the rank of elliptic curves ordered by height (Katz-Sarnak).

    In this talk, we will give an introduction to these sort of questions, focusing on Malle’s conjecture. Additionally, we will explain how to formulate function field analogues of this conjecture and transform this conjecture into a problem in algebraic topology (about the homology of certain moduli spaces of branched covers of P^1). In joint work with Ellenberg and Tran, we partially solved this problem, giving the upper bound in Malle’s conjecture.

    Updated on Feb 20, 2019 11:23 AM PST
  7. 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
  8. Combinatorics Seminar:

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

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

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

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

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:06 PM PST
  13. Graduate Student Seminar

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

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

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

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

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

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

    Location: MSRI: Baker Board Room
    Updated on Feb 22, 2019 09:18 AM PST
  20. BGMS Seminar:

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

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

    Location: MSRI: Simons Auditorium
    Created on Jan 29, 2019 01:19 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
    Updated on Feb 22, 2019 09:33 AM PST
  29. BGMS Seminar:

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

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

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

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

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

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

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

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

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

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

    Location: MSRI: Baker Board Room
    Updated on Feb 22, 2019 09:34 AM PST
  40. BGMS Seminar:

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

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

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

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

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

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

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

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

    Location: MSRI: Baker Board Room
    Updated on Feb 22, 2019 09:35 AM PST
  49. BGMS Seminar:

    Location: MSRI: Baker Board Room
    Created on Jan 29, 2019 01:16 PM PST
  50. Graduate Student Seminar

    Location: MSRI: Baker Board Room
    Created on Feb 22, 2019 01:38 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
    Updated on Feb 22, 2019 09:36 AM PST
  58. BGMS Seminar:

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

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

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

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

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

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

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

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

    Location: MSRI: Baker Board Room
    Updated on Feb 22, 2019 09:37 AM PST
  67. BGMS Seminar:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    Location: MSRI: Baker Board Room
    Created on Feb 22, 2019 01:38 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. Graduate Student Seminar

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

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