Abstract
The minimal degeneration singularities in the affine Grassmannians of simple simply laced algebraic groups are determined to be either Kleinian singularities of type A or closures of minimal nilpotent orbits. The singularities for non-simply laced types are studied by intersection cohomology and equivariant Chow group methods.
Citation
Anton Malkin. Viktor Ostrik. Maxim Vybornov. "The minimal degeneration singularities in the affine Grassmannians." Duke Math. J. 126 (2) 233 - 249, 15 February 2005. https://doi.org/10.1215/S0012-7094-04-12622-3
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