Every irreducible component of the Delta-Springer fiber Y_{n,n-1}, and every intersection of components, is a smooth iterated Grassmannian bundle, with explicit cohomology presentations and a Dyck-path Poincare polynomial formula.
An exotic Springer correspondence for symplectic groups
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abstract
This paper is a sequel to math.RT/0601155. Let G be a complex symplectic group. In math.RT/0601155, we constructed a certain G-variety N = N_1, which we call the (1-) exotic nilpotent cone. In this paper, we study the set of G-orbits of the variety N. It turns out that the variety N gives a variant of the Springer correspondence for the Weyl group of type C, but shares a similar flavor with that of type A case. (I.e. there appears no non-trivial local system and the correspondence is bijective.) As an application, we present one sufficient condition for the bijectivity of our exotic Deligne-Langlands correspondence [K1].
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Irreducible components of two-column $\Delta$-Springer fibers
Every irreducible component of the Delta-Springer fiber Y_{n,n-1}, and every intersection of components, is a smooth iterated Grassmannian bundle, with explicit cohomology presentations and a Dyck-path Poincare polynomial formula.