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Manin pairs and moment maps revisited

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arxiv 2404.17518 v2 pith:I6ZLU54U submitted 2024-04-26 math.DG

classification math.DG
keywords spacesmapsmomentquasi-poissonvaluedresultalekseevbijective
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abstract

The notion of quasi-Poisson $G$-spaces with $D/G$-valued moment maps was introduced by Alekseev and Kosmann-Schwarzbach in 1999. Our main result is a \emph{Lifting Theorem}, establishing a bijective correspondence between the categories of quasi-Poisson $G$-spaces with $D/G$-valued moment maps and of quasi-Poisson $G\times G$-spaces with $D$-valued moment maps. Using this result, we give simple constructions of fusion and conjugation for these spaces, and new examples coming from moduli spaces.

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Cited by 1 Pith paper

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  1. Introduction to moduli spaces and Dirac geometry

    math.DG 2025-06 accept novelty 2.0 of 10

    An expository survey that constructs the quasi-symplectic 2-form on moduli spaces of flat bundles and reinterprets it via Dirac geometry.

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