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All Colloquia & Seminars

Current Seminars

Upcoming Seminars

  1. NAG Geometric Representation Theory Seminar: "Okounkov's conjecture via BPS Lie algebras"

    Location: SLMath: Eisenbud Auditorium
    Speakers: Ben Davison (University of Edinburgh)

    Zoom Link

    Given an arbitrary finite quiver Q, Maulik and Okounkov defined a new Yangian-style quantum group.  It is built from the FRT formalism and their construction of R matrices on the cohomology of Nakajima quiver varieties, via the stable envelopes that Maulik and Okounkov also defined.  Just as in the case of ordinary Yangians, there is a Lie algebra g_Q inside their new algebra, and the Yangian is a deformation of the current algebra of this Lie algebra. Outside of extended ADE type, numerous basic features of g_Q have remained mysterious since the outset of the subject, for example, the
    dimensions of the graded pieces.  A conjecture of Okounkov predicts that these dimensions are given by the coefficients of Kac's polynomials, which count isomorphism classes of absolutely indecomposable Q-representations over finite fields.  I will explain a recent result, with Botta, stating that the Maulik-Okounkov Lie algebra associated to a quiver Q is isomorphic to the BPS Lie algebra associated to the tripled quiver of Q, along with its canonical cubic potential.  Thanks to recent joint work of myself with Hennecart and Schlegel Mejia, this result implies Okounkov's conjecture, as well as determining the generators and relations of g_Q in terms of intersection cohomology of singular quiver varieties.

    Updated on Feb 27, 2024 02:29 PM PST
  2. NAG Colloquium

    Location: SLMath: Eisenbud Auditorium, Online/Virtual

    Zoom Link

    Updated on Jan 23, 2024 01:45 PM PST
  3. NAG Noncommutative Projective Schemes Seminar: "Terra Incognita: Four dimensional Koszul Artin-Schelter regular algebras of dimension four"

    Location: SLMath: Eisenbud Auditorium, Online/Virtual
    Speakers: Colin Ingalls (Carleton University)

    Zoom Link

    This is joint work and a report of work in progress by Vishal Bhatoy and Ravali Nookala.  Regular algebras of dimension three were classified in 1987 by Artin-Schelter, and subsequently reclassified geometrically by Artin, Tate and Van den Bergh.  This work can be considered to be the genesis of noncommutative algebraic geometry. The classification problem is open in dimension four despite a large amount of work by many people.  We use the Kodaira-Spencer for about 40 known families to identify about 20 components of the moduli space which we cannot necessarily distinguish.  We discuss a number of open problems.

     

    Updated on Feb 28, 2024 03:49 PM PST
  4. COMA Colloquium: "How to (sometimes) glue and split toric ideals, and the consequences"

    Location: SLMath: Eisenbud Auditorium, Online/Virtual
    Speakers: Philippe Gimenez (University of Valladolid)

    Zoom Link

    Gluing two semigroups is an operation originally used to classify monomial curves that are complete intersections. It produces a new semigroup whose associated toric ideal is the sum of the two original toric ideals, plus a gluing binomial. This cannot always be done. The splitting operation is a kind of reverse operation where a toric ideal splits as the sum of two toric ideals. For both operations one would like to construct the syzygies of the big toric ideal from the syzygies of the two smaller parts. During this talk, we will see how homogeneous semigroups can always be glued by embedding them suitably in a higher dimensional space. That will produce a toric ideal that splits. In particular, we will see that two toric ideals associated to graphs always occur as the splitting of a toric ideal associated to a graph or a 3-regular hypergraph whose minimal graded free resolution is the tensor product of the resolutions of the
    two smaller original ideals. This talk is based on past and ongoing work with Hema Srinivasan. 

    Updated on Feb 28, 2024 08:42 AM PST
  5. COMA Working Group: Syzygies

    Location: SLMath: Baker Board Room
    Updated on Feb 15, 2024 10:06 AM PST
  6. COMA Seminar

    Location: SLMath: Eisenbud Auditorium, Front Courtyard
    Speakers: Yevgeniya Tarasova (Purdue University)

    Zoom Link

    Updated on Jan 23, 2024 02:16 PM PST
  7. COMA Seminar

    Location: SLMath: Eisenbud Auditorium, Online/Virtual
    Speakers: Swaraj Pande (University of Michigan)

    Zoom Link

    Updated on Feb 02, 2024 04:05 PM PST
  8. COMA Special Topic

    Location: SLMath: Baker Board Room, Online/Virtual

    Zoom Link

    Updated on Jan 23, 2024 02:54 PM PST
  9. NAG Geometric Representation Theory Seminar: Okounkov's conjecture via BPS Lie algebras

    Location: SLMath: Baker Board Room, Online/Virtual
    Speakers: Ben Davison (University of Edinburgh)

    Zoom Link

    Given an arbitrary finite quiver Q, Maulik and Okounkov defined a new Yangian-style quantum group.  It is built from the FRT formalism and their construction of R matrices on the cohomology of Nakajima quiver varieties, via the stable envelopes that Maulik and Okounkov also defined.  Just as in the case of ordinary Yangians, there is a Lie algebra g_Q inside their new algebra, and the Yangian is a deformation of the current algebra of this Lie algebra. Outside of extended ADE type, numerous basic features of g_Q have remained mysterious since the outset of the subject, for example, the
    dimensions of the graded pieces.  A conjecture of Okounkov predicts that these dimensions are given by the coefficients of Kac's polynomials, which count isomorphism classes of absolutely indecomposable Q-representations over finite fields.  I will explain a recent result, with Botta, stating that the Maulik-Okounkov Lie algebra associated to a quiver Q is isomorphic to the BPS Lie algebra associated to the tripled quiver of Q, along with its canonical cubic potential.  Thanks to recent joint work of myself with Hennecart and Schlegel Mejia, this result implies Okounkov's conjecture, as well as determining the generators and relations of g_Q in terms of intersection cohomology of singular quiver varieties.

    Updated on Feb 27, 2024 02:30 PM PST
  10. NAG Colloquium

    Location: SLMath: Online/Virtual, Baker Board Room

    Zoom Link

    Updated on Jan 23, 2024 01:45 PM PST
  11. COMA Colloquium

    Location: SLMath: Baker Board Room, Online/Virtual

    Zoom Link

    Updated on Jan 23, 2024 12:44 PM PST
  12. COMA Working Group: Syzygies

    Location: SLMath: Baker Board Room
    Updated on Feb 15, 2024 10:10 AM PST
  13. COMA Seminar

    Location: SLMath: Baker Board Room, Online/Virtual

    Zoom Link

    Updated on Jan 23, 2024 02:16 PM PST
  14. COMA Special Topic

    Location: SLMath: Eisenbud Auditorium, Online/Virtual

    Zoom Link

    Updated on Jan 23, 2024 03:03 PM PST
  15. NAG Colloquium

    Location: SLMath: Eisenbud Auditorium, Online/Virtual

    Zoom Link

    Updated on Jan 23, 2024 01:45 PM PST
  16. COMA Colloquium

    Location: SLMath: Eisenbud Auditorium, Online/Virtual

    Zoom Link

    Updated on Jan 23, 2024 12:46 PM PST
  17. COMA Working Group: Syzygies

    Location: SLMath: Baker Board Room
    Updated on Feb 15, 2024 10:16 AM PST
  18. COMA Seminar

    Location: SLMath: Eisenbud Auditorium, Front Courtyard

    Zoom Link

    Updated on Jan 23, 2024 02:16 PM PST
  19. COMA Special Topic

    Location: SLMath: Eisenbud Auditorium, Online/Virtual

    Zoom Link

    Updated on Jan 23, 2024 03:05 PM PST
  20. NAG Colloquium

    Location: SLMath: Eisenbud Auditorium, Online/Virtual

    Zoom Link

    Updated on Jan 23, 2024 01:45 PM PST
  21. COMA Colloquium

    Location: SLMath: Eisenbud Auditorium, Online/Virtual

    Zoom Link

    Updated on Jan 23, 2024 12:47 PM PST
  22. COMA Working Group: Syzygies

    Location: SLMath: Baker Board Room
    Updated on Feb 15, 2024 10:20 AM PST
  23. COMA Seminar

    Location: SLMath: Eisenbud Auditorium, Front Courtyard

    Zoom Link

    Updated on Jan 23, 2024 02:16 PM PST
  24. COMA Colloquium

    Location: SLMath: Eisenbud Auditorium, Online/Virtual

    Zoom Link

    Updated on Feb 13, 2024 09:36 AM PST
  25. COMA Special Topic

    Location: SLMath: Eisenbud Auditorium, Online/Virtual

    Zoom Link

    Updated on Jan 23, 2024 03:06 PM PST
  26. NAG Colloquium

    Location: SLMath: Eisenbud Auditorium, Online/Virtual

    Zoom Link

    Updated on Jan 23, 2024 01:45 PM PST
  27. COMA Working Group: Syzygies

    Location: SLMath: Baker Board Room
    Updated on Feb 15, 2024 10:25 AM PST
  28. NAG Colloquium

    Location: SLMath: Eisenbud Auditorium, Online/Virtual

    Zoom Link

    Updated on Jan 23, 2024 01:45 PM PST
  29. COMA Colloquium

    Location: SLMath: Eisenbud Auditorium, Online/Virtual

    Zoom Link

    Updated on Jan 23, 2024 12:50 PM PST
  30. COMA Working Group: Syzygies

    Location: SLMath: Baker Board Room
    Updated on Feb 15, 2024 10:32 AM PST
  31. COMA Seminar

    Location: SLMath: Eisenbud Auditorium, Front Courtyard

    Zoom Link

    Updated on Jan 23, 2024 02:16 PM PST
  32. NAG Colloquium

    Location: SLMath: Eisenbud Auditorium, Online/Virtual

    Zoom Link

    Updated on Jan 23, 2024 01:45 PM PST
  33. COMA Colloquium

    Location: SLMath: Baker Board Room, Online/Virtual

    Zoom Link

    Updated on Jan 23, 2024 12:52 PM PST
  34. COMA Working Group: Syzygies

    Location: SLMath: Baker Board Room
    Updated on Feb 15, 2024 10:34 AM PST
  35. COMA Seminar

    Location: SLMath: Baker Board Room, Online/Virtual

    Zoom Link

    Updated on Jan 23, 2024 02:16 PM PST
  36. NAG Colloquium

    Location: SLMath: Eisenbud Auditorium, Online/Virtual

    Zoom Link

    Updated on Jan 23, 2024 01:45 PM PST
  37. COMA Colloquium

    Location: SLMath: Eisenbud Auditorium, Online/Virtual

    Zoom Link

    Updated on Jan 23, 2024 12:53 PM PST
  38. COMA Working Group: Syzygies

    Location: SLMath: Baker Board Room
    Updated on Feb 15, 2024 10:36 AM PST
  39. COMA Seminar

    Location: SLMath: Eisenbud Auditorium, Front Courtyard

    Zoom Link

    Updated on Jan 23, 2024 02:16 PM PST
  40. COMA Special Topic

    Location: SLMath: Online/Virtual, Baker Board Room

    Zoom Link

    Updated on Jan 23, 2024 03:10 PM PST
  41. NAG Colloquium

    Location: SLMath: Online/Virtual, Baker Board Room

    Zoom Link

    Updated on Jan 23, 2024 01:45 PM PST
  42. COMA Colloquium

    Location: SLMath: Eisenbud Auditorium, Online/Virtual

    Zoom Link

    Updated on Jan 23, 2024 12:54 PM PST
  43. COMA Working Group: Syzygies

    Location: SLMath: Baker Board Room
    Updated on Feb 15, 2024 10:37 AM PST
  44. COMA Seminar

    Location: SLMath: Front Courtyard, Baker Board Room

    Zoom Link

    Updated on Jan 23, 2024 02:16 PM PST
  45. NAG Colloquium

    Location: SLMath: Eisenbud Auditorium, Online/Virtual

    Zoom Link

    Updated on Jan 23, 2024 01:45 PM PST
  46. COMA Colloquium

    Location: SLMath: Eisenbud Auditorium, Online/Virtual

    Zoom Link

    Updated on Jan 23, 2024 01:08 PM PST
  47. COMA Working Group: Syzygies

    Location: SLMath: Baker Board Room
    Updated on Feb 15, 2024 10:39 AM PST
  48. COMA Seminar

    Location: SLMath: Eisenbud Auditorium, Front Courtyard

    Zoom Link

    Updated on Jan 23, 2024 02:16 PM PST
  1. ADJOINT 2024

    ADJOINT is a yearlong program that provides opportunities for U.S. mathematicians – especially those from the African Diaspora – to conduct collaborative research on topics at the forefront of mathematical and statistical research. Participants will spend two weeks taking part in an intensive collaborative summer session at SLMath (formerly MSRI). The two-week summer session for ADJOINT 2024 will take place June 24 to July 5, 2024 in Berkeley, California. Researchers can participate in either of the following ways: (1) joining ADJOINT small groups under the guidance of some of the nation's foremost mathematicians and statisticians to expand their research portfolio into new areas, or (2) applying to Self-ADJOINT as part of an existing or newly-formed independent research group to work on a new or established research project. Throughout the following academic year, the program provides conference and travel support to increase opportunities for collaboration, maximize researcher visibility, and engender a sense of community among participants. 

    Updated on Feb 23, 2024 03:05 PM PST

Past Seminars

  1. Seminar Family Picnic

    Updated on Feb 16, 2024 10:58 AM PST
There are more then 30 past seminars. Please go to Past seminars to see all past seminars.