Geometry/Physics Seminar

Title: Universally defined cycles
Speaker: Claire Voisin
Speaker Info: CNRS and IAS
Brief Description:
Special Note:

The Franchetta conjecture (now a theorem) says that any line bundle on the universal curve over M_g restricts to a multiple of the canonical bundle on the fibers. I will explain what is the analogous statement for smooth surfaces, namely a characterization of the Chow-theoretic Chern classes of a surface as the only cycles which are universally defined.
Date: Thursday, April 02, 2015
Time: 4:00pm
Where: Lunt 107
Contact Person: Mihnea Popa
Contact email: mpopa@math.northwestern.edu
Contact Phone:
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