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Pré-Publication, Document De Travail Année : 2019

Deformations of representations of fundamental groups of non-compact complex varieties

Résumé

We describe locally the representation varieties of fundamental groups for smooth complex manifolds admitting a compactification into a Kähler manifold, at representations coming from the monodromy of a variation of mixed Hodge structure. Given such a manifold $X$ and such a linear representation $\rho$ of its fundamental group $\pi_1(X,x)$, we use the theory of Goldman-Millson and pursue our previous work that combines mixed Hodge theory with derived deformation theory to construct a mixed Hodge structure on the formal local ring $\widehat{\mathcal{O}}_\rho$ to the representation variety of $\pi_1(X,x)$ at $\rho$. Then we show how a weighted-homogeneous presentation of $\widehat{\mathcal{O}}_\rho$ is induced directly from a splitting of the weight filtration of its mixed Hodge structure. In this way we recover and generalize theorems of Eyssidieux-Simpson ($X$ compact) and of Kapovich-Millson ($\rho$ finite).
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Dates et versions

hal-02399676 , version 1 (09-12-2019)
hal-02399676 , version 2 (11-04-2021)

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Louis-Clément Lefèvre. Deformations of representations of fundamental groups of non-compact complex varieties. 2019. ⟨hal-02399676v1⟩
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