46 citations · 312 across the 27 of their papers we have counts for
27 papers
Birational geometry for the covering of a nilpotent orbit closure II
Yoshinori Namikawa
Let be a nilpotent orbit of a complex semisimple Lie algebra and let be the finite covering associated with the universal covering of . In…
Birational geometry for the covering of a nilpotent orbit closure
Yoshinori Namikawa
A nilpotent orbit of a complex semisimple Lie algebra has finite fundamental group. Associated with an etale cover of , we have a finite cover of the closure…
A characterization of nilpotent orbit closures among symplectic singularities II
Yoshinori Namikawa
This short note is a supplement to the previous article with the same title. Here we treat a conical symplectic variety obtained as a finite covering of a (not necessarily normal)…
A characterization of nilpotent orbit closures among symplectic singularities
Yoshinori Namikawa
We prove that a conical symplectic variety with maximal weight 1 is isomorphic to one of the following: (i) an affine space with the standard symplectic form (ii) a nilpotent orbit…
A finiteness theorem on symplectic singularities
Yoshinori Namikawa
For positive integers N and d, there are only finite number of conical symplectic varieties of dimension 2d with maximal weights N, up to isomorphism. The maximal weight of a conic…
Poisson deformations and birational geometry
Yoshinori Namikawa
Let π: Y -> X be a crepant projective resolution of an affine symplectic variety X with a good C^*-action. We interpret the second cohomology H^2(Y, C) in two ways. First, H^2(Y, C…