Mixed Hodge structures on character varieties of nilpotent groups

Abstract

Let R be the connected component of the identity of the variety of representations of a finitely generated nilpotent group N into a connected reductive complex affine algebraic group G. We determine the mixed Hodge structure on the representation variety R and on the character variety R//G. We obtain explicit formulae (both closed and recursive) for the mixed Hodge polynomial of these representation and character varieties.

arXiv comment23 pages; version 3 fixes typos and adds clarification, accepted for publication in Revista Matemática Complutense

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