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Upcoming Colloquia & Seminars

  1. EGN Postdoc and student seminar: Counting nodal curves on families of surfaces

    Location: MSRI: Simons Auditorium
    Speakers: Ties Laarakker (Utrecht University)

    The Göttsche conjecture, now a theorem, states that the degree of the Severi locus of k-nodal curves in a linear system can be expressed universally as a polynomial in the four Chern numbers. Kleiman and Piene have formulated a family and cycle version of this conjecture. More precisely, it states that for a relative effective divisor on a family of surfaces, there exists a natural cycle on the base, enumerating the k-nodal fibres of the divisor. It's class can be expressed universally in the Chern data of the surface and the divisor. Using the BPS-calculus of Pandharipande and Thomas, we will prove the conjecture.

    Updated on Apr 20, 2018 01:45 PM PDT
  2. GRTA seminar: Moment graphs, Kazhdan-Lusztig polynomials and combinatorics

    Location: MSRI: Simons Auditorium
    Speakers: Leonardo Patimo (Max-Planck-Institut für Mathematik)

    Kazhdan-Lusztig polynomials contain crucial data for the representation theory of reductive groups and the geometry of flag varieties.
    In this talk I will review Braden-MacPherson-Fiebig's approach to KL polynomials using moment graphs. This provides an incarnation of the Hecke category where KL polynomials (or their positive characteristic analogue) can be computed using elementary algebra.
    I will conclude by using moment graphs to give a purely combinatorial interpretation of the coefficient of q for KL polynomials in Type A.

    Updated on Apr 19, 2018 09:04 AM PDT
  3. EGN Polyfold Lab Meeting: Scale Calculus 201 + Polyfold building blocks

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

    We will discuss inverse and implicit function theorems in Scale Calculus. 
    In the second hour, we will collaboratively make a list of existing, expected, and desirable local-local models towards describing more pseudoholomorphic curve moduli spaces as zero sets of scale-Fredholm sections.

    Updated on Apr 20, 2018 11:42 AM PDT
  4. EGN Main Seminar: Knot homology and Hilbert schemes

    Location: MSRI: Simons Auditorium
    Speakers: Evgeny Gorsky

    I will describe recent results and conjectures relating knot invariants (such as HOMFLY-PT polynomial and Khovanov-Rozansky homology) to algebraic geometry of the Hilbert scheme of points on the plane. The talk is based on joint works with Andrei Negut, Jacob Rasmussen and Matthew Hogancamp.

    Updated on Apr 20, 2018 10:59 AM PDT
  5. EGN Main Seminar: Monoidal Gerbes and Cohomological Hall (co)Algebras

    Location: MSRI: Simons Auditorium
    Speakers: Sven Meinhardt (University of Sheffield)

    I will introduce the concept of monoidal gerbes and show how to use them to twist suitable monoidal tensor categories. We will see interesting examples of this construction related to moduli stacks of objects in Calabi-Yau categories. For 3-Calabi-Yau categories we can go even further by constructing interesting monoidal functors. This allows us to define the Cohomological Hall (co)Algebra.

    Updated on Apr 20, 2018 11:34 AM PDT
  6. UC Berkeley Colloquium: Metric collapsing of hyperkahler K3 surfaces

    Location: 60 Evans Hall
    Speakers: SONG SUN

    http://events.berkeley.edu/index.php/calendar/sn/math.html?event_ID=117053

    A K3 surface is a simply connected compact complex surface with trivial canonical bundle. Moduli space of K3 surfaces has been extensively studied in algebraic geometry and it can be characterized in terms of the period map by the Torelli theorem. The differential geometric significance is that every K3 surface admits a hyperkahler metric (a metric whose holonomy group is SU(2)), which is in particular Ricci-flat. The understanding of limiting behavior of a sequence of hyperkahler K3 surfaces gives prototype for more general questions concerning Ricci curvature in Riemannian geometry. In this talk I will survey what is known on this, and talk about a new glueing construction, joint with Hans-Joachim Hein, Jeff Viaclovsky and Ruobing Zhang, that shows a multi-scale collapsing phenomenon, and discuss the connection with the Kulikov classification in algebraic geometry.

    Updated on Apr 20, 2018 08:55 AM PDT
  7. EGN Math-Physics seminar:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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