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Colloquia & Seminars


Current Seminars

  1. GRTA seminar: The ABC of p-Cells

    Location: MSRI: Simons Auditorium
    Speakers: Lars Thorge Jensen (Max-Planck-Institut für Mathematik)

    The Hecke category is a categorification of the Hecke algebra that plays an important role in geometric representation theory. Using this categorification,
    I will introduce a positive characteristic analogue of the famous Kazhdan-Lusztig basis of the Hecke algebra, called the p-canonical or p-Kazhdan-Lusztig basis.
    If time permits, I will mention connections between
    the p-Kazhdan-Lusztig basis and the representation theory of reductive algebraic groups. Motivated by the very rich theory of Kazhdan-Lusztig cells, I study cells with respect to the p-Kazhdan-Lusztig basis. Throughout the talk, I will use SL_2 as a running example. In the
    end, I will give a complete description of p-Cells in finite type A and mention some interesting results in finite types B and C.

    Updated on Feb 16, 2018 09:00 AM PST
  2. EGN Polyfold Lab Meeting: Quotient of polyfolds and equivariant fundamental class

    Location: MSRI: Baker Board Room
    Speakers: Zhengyi Zhou (University of California, Berkeley)

    I will discuss how to apply polyfolds to equivariant problems. In particular, I will define the equivariant fundamental class in the polyfold setting. Combining with the polyfold construction for Gromov-Witten invariants by Hofer, Wysocki, Zehnder, this yields the construction for equivariant Gromov-Witten invariants using polyfolds. The main tool is the quotient construction for polyfolds.

    Updated on Feb 12, 2018 08:46 AM PST
  3. EGN Main Seminar: The Geometry of equivariant elliptic cohomology

    Location: MSRI: Baker Board Room
    Speakers: Nora Ganter (The University of Melbourne)

    I will give an introduction to the construction of equivariant elliptic cohomology and then talk about some recent geometric approaches to the subject.

    Created on Feb 16, 2018 03:42 PM PST

Upcoming Seminars

  1. UC Berkeley Colloquium: p-adic algebraic K-theory and topological cyclic homology

    Location: 60 Evans Hall
    Speakers: Akhil Mathew (University of Chicago)

    http://events.berkeley.edu/index.php/calendar/sn/math.html?event_ID=115325

    Algebraic K-theory is a basic invariant of rings connected to deep phenomena in arithmetic, geometry, and topology. When one works with the p-adic K-theory of p-adic rings, the theory of trace maps and the apparatus of topological cyclic homology (TC) is often a highly effective approximation used in many computations. The theory TC, while more conceptually involved than K-theory, is often easier to work with. In this talk, I will give a gentle introduction to these theories and explain their applications to some new structural results in K-theory.

    Updated on Feb 16, 2018 09:42 AM PST
  2. EGN Open GW seminar: Torus knots, open Gromov-Witten invariants, and topological recursion

    Location: 748 Evans Hall
    Speakers: Zhengyu Zong (Mathematical Sciences Center, Tsinghua University)

    Given a torus knot K in S^3, one can construct a Lagrangian L_K in the resolved conifold X under the conifold transition. On the other hand, the pair (X, L_K) corresponds to a mirror curve under mirror symmetry. There exist equivalences between the following three objects: The colored HOMFLY polynomial of K, the all genus open-closed Gromov-Witten theory of (X, L_K), and the topological recursion on the mirror curve. The above equivalences are given by the large N duality, mirror symmetry, and the matrix model for the torus knot respectively. In this talk, I will mainly focus on the mirror symmetry between the open-closed Gromov-Witten theory of (X, L_K) and the topological recursion on the mirror curve. I will also mention the other two equivalences if there is enough time. This talk is based on the paper 1607.01208 joint with Bohan Fang.

    Created on Feb 21, 2018 03:51 PM PST
  3. EGN symplectic geometry and mirror symmetry seminar: Lagrangian tori in CP^2

    Location: 748 Evans Hall
    Speakers: Renato Ferreira de Velloso Vianna (Center for Mathematical Sciences)

    We will present an infinite series of monotone Lagrangian tori in CP^2, which arise as fibres of almost toric fibrations (ATFs). We show how to distinguish these tori up to the action of Symp(CP^2). Time permiting, based on a joint work with Tonkonog and Shelukhin, we will present (a 4-dimensional version) of an invariant for any Lagrangian, and use it to determine the space of almost toric fibres modulo the action of Symp(CP^2).

    Created on Feb 15, 2018 08:50 AM PST
  4. EGN Moduli and Representation Theory seminar: Jacobi forms, differential operators, and vertex operator algebras

    Location: MSRI: Baker Board Room
    Speakers: Matthew Krauel (California State University)

    We will briefly explain how differential operators of Jacobi forms arise in the theory of vertex operator algebras (VOAs). We then introduce a family of differential operators that arise for a certain class of VOAs and explain some possible applications. Time permitting, we will also mention how the theory of VOAs can be used to show how certain polynomials of quasi-Jacobi forms are Jacobi forms.

    Updated on Feb 21, 2018 11:51 AM PST
  5. GRTA seminar: Semisimplification of tensor categories

    Location: MSRI: Simons Auditorium
    Speakers: Pavel Etingof (Massachusetts Institute of Technology)

    We develop the theory of semisimplifications of tensor categories defined by Barrett and Westbury. By definition, the semisimplification of a tensor category is its quotient by the tensor ideal of negligible morphisms, i.e., morphisms $f$ such that $Tr(fg)=0$ for any morphism $g$ in the opposite direction. In particular, we compute the semisimplification of the category of representations of a finite group in characteristic $p$ in terms of representations of the normalizer of its Sylow $p$-subgroup. This allows us to compute the semisimplification of the representation category of the symmetric group $S_{n+p}$ in characteristic $p$, where $n=0,...,p-1$, and of the abelian envelope of the Deligne category, $Rep^{ab} S_t$. We also compute the semisimplification of the category of representations of the Kac-De Concini quantum group of the Borel subalgebra of $sl_2$. Finally, we study tensor functors between Verlinde categories of semisimple algebraic groups arising from the semisimplification construction, and objects of finite type in categories of modular representations of finite groups (i.e., objects generating a fusion category in the semisimplification). This is joint work with Victor Ostrik.

    Updated on Feb 21, 2018 08:51 AM PST
  6. EGN Polyfold Lab Meeting:

    Location: MSRI: Baker Board Room
    Created on Feb 06, 2018 08:50 AM PST
  7. EGN Main Seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:40 PM PST
  8. EGN Main Seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:41 PM PST
  9. UC Berkeley Colloquium:

    Location: 60 Evans Hall
    Speakers: Monica Vazirani (University of California, Davis)
    Created on Jan 24, 2018 10:41 AM PST
  10. EGN Symplectic geometry and mirror symmetry seminar: Wall-crossing formulae for LG potentials

    Location: 748 Evans Hall
    Speakers: Dmitry Tonkonog (University of California, Berkeley)

    I will discuss an "umbrella" wall-crossing theorem for Landau-Ginzburg potentials of monotone Lagrangian submanifolds. I will try to cover two proof methods (using the relative Fukaya category and the Borman-Sheridan class) and/or some applications. Most of the material is joint work with James Pascaleff.

    Created on Feb 21, 2018 09:20 AM PST
  11. EGN Math-Physics seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:22 PM PST
  12. GRTA seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:29 PM PST
  13. GRTA seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:30 PM PST
  14. EGN Polyfold Lab Meeting:

    Location: MSRI: Baker Board Room
    Created on Feb 06, 2018 08:50 AM PST
  15. EGN Main Seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:40 PM PST
  16. EGN Main Seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:41 PM PST
  17. UC Berkeley Colloquium:

    Location: 60 Evans Hall
    Speakers: Greta Panova (University of Pennsylvania)
    Created on Jan 24, 2018 10:42 AM PST
  18. EGN Open GW seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:55 PM PST
  19. EGN Math-Physics seminar:

    Location: MSRI: Baker Board Room
    Created on Feb 05, 2018 03:22 PM PST
  20. GRTA seminar:

    Location: MSRI: Baker Board Room
    Created on Feb 05, 2018 03:29 PM PST
  21. GRTA seminar:

    Location: MSRI: Baker Board Room
    Created on Feb 05, 2018 03:30 PM PST
  22. EGN Polyfold Lab Meeting:

    Location: MSRI: Baker Board Room
    Created on Feb 06, 2018 08:50 AM PST
  23. EGN Main Seminar:

    Location: MSRI: Baker Board Room
    Created on Feb 05, 2018 03:40 PM PST
  24. EGN Main Seminar:

    Location: MSRI: Baker Board Room
    Created on Feb 05, 2018 03:41 PM PST
  25. UC Berkeley Colloquium:

    Location: 60 Evans Hall
    Speakers: Aner Shalev (The Hebrew University of Jerusalem)
    Created on Jan 24, 2018 10:43 AM PST
  26. EGN Open GW seminar:

    Location: MSRI: Baker Board Room
    Created on Feb 05, 2018 03:55 PM PST
  27. GRTA seminar:

    Location: MSRI: Baker Board Room
    Created on Feb 05, 2018 03:29 PM PST
  28. GRTA seminar:

    Location: MSRI: Baker Board Room
    Created on Feb 05, 2018 03:30 PM PST
  29. Chern Lectures:

    Speakers: Martin Hairer (University of Warwick)

    https://math.berkeley.edu/about/events/lectures/chern

    Created on Jan 24, 2018 10:31 AM PST
  30. Chern Lectures

    Speakers: Martin Hairer (University of Warwick)

    https://math.berkeley.edu/about/events/lectures/chern

    Created on Jan 24, 2018 10:32 AM PST
  31. Chern Lectures

    Speakers: Martin Hairer (University of Warwick)

    https://math.berkeley.edu/about/events/lectures/chern

    Created on Jan 24, 2018 10:32 AM PST
  32. Chern Lectures

    Speakers: Martin Hairer (University of Warwick)

    https://math.berkeley.edu/about/events/lectures/chern

    Created on Jan 24, 2018 10:32 AM PST
  33. EGN Math-Physics seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:22 PM PST
  34. GRTA seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:29 PM PST
  35. GRTA seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:30 PM PST
  36. EGN Polyfold Lab Meeting:

    Location: MSRI: Baker Board Room
    Created on Feb 06, 2018 08:50 AM PST
  37. EGN Main Seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:40 PM PST
  38. EGN Main Seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:41 PM PST
  39. EGN Math-Physics seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:22 PM PST
  40. GRTA seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:29 PM PST
  41. GRTA seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:30 PM PST
  42. EGN Polyfold Lab Meeting:

    Location: MSRI: Baker Board Room
    Created on Feb 06, 2018 08:50 AM PST
  43. EGN Main Seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:40 PM PST
  44. EGN Main Seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:41 PM PST
  45. UC Berkeley Colloquium:

    Location: 60 Evans Hall
    Speakers: Sylvie Corteel (Université de Paris VII (Denis Diderot))
    Created on Jan 24, 2018 10:43 AM PST
  46. EGN Open GW seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:55 PM PST
  47. EGN Math-Physics seminar:

    Location: MSRI: Baker Board Room
    Created on Feb 05, 2018 03:22 PM PST
  48. EGN Polyfold Lab Meeting:

    Location: MSRI: Baker Board Room
    Created on Feb 06, 2018 08:50 AM PST
  49. EGN Main Seminar:

    Location: MSRI: Baker Board Room
    Created on Feb 05, 2018 03:40 PM PST
  50. EGN Main Seminar:

    Location: MSRI: Baker Board Room
    Created on Feb 05, 2018 03:41 PM PST
  51. UC Berkeley Colloquium:

    Location: 60 Evans Hall
    Speakers: Dusa McDuff (Barnard College)
    Created on Jan 24, 2018 10:44 AM PST
  52. EGN Open GW seminar:

    Location: MSRI: Baker Board Room
    Created on Feb 05, 2018 03:55 PM PST
  53. EGN Math-Physics seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:22 PM PST
  54. GRTA seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:29 PM PST
  55. GRTA seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:30 PM PST
  56. EGN Polyfold Lab Meeting:

    Location: MSRI: Baker Board Room
    Created on Feb 06, 2018 08:50 AM PST
  57. EGN Main Seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:40 PM PST
  58. EGN Main Seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:41 PM PST
  59. EGN Open GW seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:55 PM PST
  60. EGN Math-Physics seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:22 PM PST
  61. GRTA seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:29 PM PST
  62. GRTA seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:30 PM PST
  63. EGN Polyfold Lab Meeting:

    Location: MSRI: Baker Board Room
    Created on Feb 06, 2018 08:50 AM PST
  64. EGN Main Seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:40 PM PST
  65. EGN Main Seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:41 PM PST
  66. UC Berkeley Colloquium:

    Location: 60 Evans Hall
    Created on Jan 24, 2018 10:46 AM PST
  67. EGN Open GW seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:55 PM PST
  68. EGN Math-Physics seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:22 PM PST
  69. GRTA seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:29 PM PST
  70. GRTA seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:30 PM PST
  71. EGN Polyfold Lab Meeting:

    Location: MSRI: Baker Board Room
    Created on Feb 06, 2018 08:50 AM PST
  72. EGN Main Seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:40 PM PST
  73. EGN Main Seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:41 PM PST
  74. EGN Open GW seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:55 PM PST
  75. EGN Math-Physics seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:22 PM PST
  76. GRTA seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:29 PM PST
  77. GRTA seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:30 PM PST
  78. EGN Polyfold Lab Meeting:

    Location: MSRI: Baker Board Room
    Created on Feb 06, 2018 08:50 AM PST
  79. EGN Main Seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:40 PM PST
  80. EGN Main Seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:41 PM PST
  81. EGN Open GW seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:55 PM PST
  82. Seminar Sequence

    Location: MSRI: Simons Auditorium
    Created on Aug 31, 2017 03:27 PM PDT
  83. GRTA seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:29 PM PST
  84. GRTA seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:30 PM PST
  85. EGN Polyfold Lab Meeting:

    Location: MSRI: Baker Board Room
    Created on Feb 06, 2018 08:50 AM PST
  86. EGN Main Seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:40 PM PST
  87. EGN Main Seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:41 PM PST
  88. EGN Open GW seminar:

    Location: MSRI: Simons Auditorium
    Created on Feb 05, 2018 03:55 PM PST

Past Seminars

  1. Seminar 5-Minute Talks

    Updated on Feb 08, 2018 01:48 PM PST
  2. Seminar 5-Minute Talks

    Updated on Feb 08, 2018 01:47 PM PST
  3. Seminar 5-Minute Talks

    Updated on Feb 08, 2018 01:47 PM PST
There are more then 30 past seminars. Please go to Past seminars to see all past seminars.