Hausdorff School: “Perverse Sheaves in Enumerative Geometry”

Dates: February 10 - 14, 2020

Venue: Lipschitz-Saal (Endenicher Allee 60, Bonn)

Organizers: Georg Oberdieck (Bonn), Johannes Schmitt (Bonn)

Sheaf-theoretic methods play an increasing role in the enumerative geometry of algebraic varieties. In this direction, Maulik and Toda recently proposed a mathematical definition of Gopakumar-Vafa invariants using perverse sheaves. These invariants of Calabi-Yau threefolds were first predicted in physics in the 90s and conjecturally reflect a deeper hidden structure (BPS algebras) of the variety which is of independent interest in representation theory and geometry.

This winter school, directed at graduate students and postdocs, will center around three mini courses introducing perverse sheaves, vanishing cycles and Gopakumar-Vafa invariants. The courses will be complemented by several introductory lectures as well as shorter research talks.

Key Speakers: The following speakers will give a lecture series:

  • Sven Meinhardt (University of Sheffield)
  • Luca Migliorini (University of Bologna)
  • Yukinobu Toda (IPMU, Tokyo)

Additional Speakers:

  • Pierrick Bousseau (ETH Zürich)
  • Ben Davison (University of Edinburgh)
  • Albrecht Klemm (University of Bonn) tbc
  • Giulia Saccà (MIT) tbc
  • Junliang Shen (MIT) 
  • Jacopo Stoppa (SISSA)

The schedule will be announced in due time.

In case you are interested in participating the Hausdorff school, please fill out the
application form Limited financial support is available. The deadline for applications is October 15, 2019. Applicants will be notified early November. Late applications may be considered until the summer school is fully booked.

In case of questions, please contact Georg Oberdieck at sheaves(at)