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arXiv · 2304.10798

Every type A quiver locus is a Kazhdan-Lusztig variety

Jiajun Xu·Guanglian Zhang
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Abstract

The Zariski closures of the orbits for representations of type A Dynkin quivers under the action of general linear groups (i.e. quiver loci) exhibit a profound connection with Schubert varieties. In this paper, we present a scheme-theoretical isomorphism between a type A quiver locus and the intersection of an opposite Schubert cell and a Schubert variety, also known as a Kazhdan-Lusztig variety in geometric representation theory. Our results generalize and unify the Zelevinsky maps for equioriented type A quiver loci and bipartite type A quiver loci, as presented respectively by A. V. Zelevinsky in 1985 and by R. Kinser and J. Rajchgot in 2015. Through this isomorphism, we establish a direct and natural connection between type A quiver loci and Schubert varieties. We compute an explicit relationship between Zelevinsky permutations and the indecomposable factors of the corresponding representations. Additionally, we present three applications of our isomorphism with examples in order to justify its further potentials.

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Jiajun Xu, Guanglian Zhang. 2023-04-21. Every type A quiver locus is a Kazhdan-Lusztig variety. https://arxiv.org/abs/2304.10798

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