Spring 2021
  • Joint working group (Bonn-Paris):
Topics in hyperkähler geometry
  Friday 10:00-12:00 (typically two talks 10:00-10:45; 11:00-11:45 with plenty of questions)
16 April: F. Anella & D. Huybrechts: Semipositive line bundles (Campana-Peternell-Oguiso and Verbitsky) pdf
23 April: A. Bottini: Looijenga-Lunts algebra and Verbitsky's theorem Bottini.pdf
30 April: P. Beri & O. Debarre: Betti numbers (Guan, Salamon,...) Beri.pdf Debarre.pdf
7 May: No seminar
14 May: M. Varesco & C. Voisin: Kuga-Satake (classical theory and work of Markman-O'Grady) pdf
21 May: T. Beckmann: Derived categories and derived monodromy (work of Taelman) pdf
28 May: No seminar
4 June: D. Huybrechts & M. Mauri: Lagrangian fibrations (Matsushita, Shen & Yin) pdf
11 June: G. Oberdieck & J. Song: Representation theory and cohomology (Green-Kim-Laza-Robles) pdf
Meeting-ID: 932 1678 8902
Code: e(K3^[2])



Fall 2020
  • Joint working group (Bonn-Paris):
Moduli spaces of K3 surfaces and hyperkähler varieties.
  Friday 10:15-11:45
  Meeting-ID: 991 6520 6652
  Code: e(K3^[2])
  Notes of talks:
    Olivier Debarre: NL cycles, pdf
    Emre Sertöz: NL divisors are the coefficients of a modular form, pdf
    Fabrizio Anella: Picard groups and NL cycles on F_g pdf
    Daniel Huybrechts: Hodge line bundle, slides
    Yajnaseni Dutta: Tautological classes pdf
    Emanuele Macrì: Moduli spaces of hyperkähler manifolds pdf
    Thorsten Beckmann & Mirko Mauri: Tautological classes on moduli spaces of hyperkähler manifolds pdf
    Johannes Schmitt: Relations in the tautological ring of the moduli of K3 surfaces pdf
    Georg Oberdieck: Relations in the tautological ring of the moduli of K3 surfaces pdf
    Oishee Banerjee: Picard group of Kg for small g, after Greer, Li, and Tian pdf