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.

中文翻译：

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简并的仿射国旗品种和箭袋草

我们研究有限维近似，以使用颤抖的格拉斯曼算法对循环颤抖进行仿射标志变体的退化版本。我们证明他们接受仿射Dellac构型参数化的细胞分解，并且它们的不可还原成分是具有合理奇点的正常Cohen-Macaulay品种。