Melody Chan, October 22, 2021

Title: The top-weight rational cohomology of Ag

Abstract: In joint work with Madeline Brandt, Juliette Bruce, Margarida Melo, Gwyneth Moreland, and Corey Wolfe, we recently identified new top-weight rational cohomology classes for moduli spaces Ag of abelian varieties, by using computations of Voronoi complexes for GLg(Z) of Elbaz-Vincent--Gangl--Soulé. In this talk, I will try to explain these results from the beginning, surveying some of the main techniques and ingredients.