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.
On the singularity of the irreducible components of a Springer fiber in sln
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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.