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Harder-Narasimhan Filtration on Moment Map for Quiver Representations (2511.02449v1)
Published 4 Nov 2025 in math.RT and math.AG
Abstract: For a quiver without loops with many edges, we generalize the methods of Kac, Crawley-Boevey and Reineke and compute the dimension of Harder-Narasimhan strata of the zero set of the moment map. We notice a link between this dimension and the terms in the Kac's polynomial, which is given by the equivariant cohomology of this zero set.
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