Seminario di algebra e geometria
ore
11:00
presso Seminario I
Abstract: I will talk about joint work with Baohua Fu, Paul Levy and
Eric Sommers about the geometry of nilpotent cones of complex semisimple
Lie algebras, particularly in exceptional types (Kraft and Procesi
studied classical types in the 1980's). One very particular singularity
in E8 led us to consider a family of 4-dimensional isolated symplectic
singularities; in another paper with two more authors (Gwyn Bellamy and
Cédric Bonnafé), we show that they admit many different descriptions and
that they have trivial local fundamental group (so they are not quotient
singularities), thus answering a question that Beauville raised in 2000.