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math.RT2020
Spherical birational sheets in reductive groups
Filippo Ambrosio, Mauro Costantini
We classify the spherical birational sheets in a complex simple simply-connected algebraic group. We use the classification to show that, when is a connected reductive complex…
math.RT2012★ 3 cited
On Lusztig's map for spherical unipotent conjugacy classes
Giovanna Carnovale, Mauro Costantini
We provide an alternative description of the restriction to spherical unipotent conjugacy classes, of Lusztig's map Psi from the set of unipotent conjugacy classes in a connected r…
math.RT2008★ 1 cited
On the coordinate ring of spherical conjugacy classes
Mauro Costantini
Let G be a simple algebraic group over an algebraically closed field of characteristic zero and X be a spherical conjugacy class of G. We determine the decomposition of the coordin…