The non-Gorenstein-locus conjecture for K-orbit closures

Let YγY_{\gamma} be a KK-orbit closure, and suppose the maximal components of its singular locus are Oα1,,Oαk\mathcal O_{\alpha_1},\ldots,\mathcal O_{\alpha_k}. Non-Gorenstein-locus conjecture. The orbit Oβ\mathcal O_{\beta} appears in the non-Gorenstein locus of YγY_{\gamma} if and only if

βαi\beta\leq\alpha_i

for some ii such that YγY_{\gamma} is non-Gorenstein along Oαi\mathcal O_{\alpha_i}. This proposes that the non-Gorenstein locus is determined by the generic singularities along the maximal components of the singular locus; the assertion remains open.

Sources & referencesView supporting material

Primary source

Benjamin J. Wyser and Alexander Yong, “Polynomials for GL_p x GL_q orbit closures in the flag variety”, arXiv:1308.2632 (2014).

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