Calendar
- 10May 10, 2022
Deformation of Geometric Structures in Current Mathematics: A celebration of the works of Masatake Kuranishi
On May 9–12, 2022, the CMSA will host the conference “Deformations of structures and moduli in geometry and analysis: a Memorial in honor of Professor Masatake Kuranishibe” organized by Tristian Collins (MIT) and Shing-Tung Yau.
The conference will be held in room G10 of the CMSA, located at 20 Garden Street, Cambridge, MA. For a list of lodging options convenient to the Center, please visit our recommended lodgings page.
Speakers:
Charles Fefferman (Princeton University)
Teng Fei (Rutgers University)
Robert Friedman (Columbia University)
Kenji Fukaya (Simons Center, Stony Brook)
Akito Futaki (Tsinghua University)
Victor Guillemin (Massachusetts Institute of Technology)
Nigel Hitchin (Oxford University)
Blaine Lawson (Stony Brook University)
Yu-Shen Lin (Boston University)
Melissa C.C. Liu (Columbia University)
Takeo Ohsawa (Nagoya University)
Duong H. Phong (Columbia University)
Sebastien Picard (University of British Columbia)
Paul Seidel (Massachusetts Institute of Technology)
Gabor Szekelyhidi (University of Notre Dame)
Claire Voisin (Institut de Mathematiques, Jussieu, France)
Shing-Tung Yau (Harvard University)
“For more information, please see https://cmsa.fas.harvard.
edu/kuranish-conference/ Harvard-MIT Algebraic Geometry Seminar: Obstructions to rationality for conic bundle threefolds
Benoist and Wittenberg recently introduced a new rationality obstruction that refines the classical the Clemens–Griffiths intermediate Jacobian obstruction to rationality, and exhibited its strength by showing that this new obstruction characterizes rationality for intersections of two quadrics. We show that this phenomenon does not extend to all geometrically rational threefolds. We construct examples of conic bundle threefolds over P^2 that have no refined intermediate Jacobian obstruction to rationality, yet fail to be rational. This is joint work with S. Frei, L. Ji, S. Sankar, and I. Vogt.