Degenerate Affine Flag Varieties and Quiver Grassmannians

We study finite dimensional approximations to degenerate versions of affine flag varieties using quiver Grassmannians for cyclic quivers. We prove that they admit cellular decompositions parametrized by affine Dellac configurations, and that their irreducible components are normal Cohen-Macaulay varieties with rational singularities.

Automated summary

This study focuses on the finite dimensional approximations of degenerate versions of affine flag varieties using quiver Grassmannians for cyclic quivers. The research proves that these approximations can be decomposed into cells parametrized by affine Dellac configurations, and their irreducible components are normal Cohen-Macaulay varieties with rational singularities.