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- W2167284212 abstract "In this work we use Hodge theoretic methods to study homotopy types of complex projective manifolds with arbitrary fundamental groups. The main tool we use is the textit{schematization functor} $X mapsto (Xotimes mathbb{C})^{sch}$, introduced by the third author as a substitute for the rationalization functor in homotopy theory in the case of non-simply connected spaces. Our main result is the construction of a textit{Hodge decomposition} on $(Xotimesmathbb{C})^{sch}$. This Hodge decomposition is encoded in an action of the discrete group $mathbb{C}^{times delta}$ on the object $(Xotimes mathbb{C})^{sch}$ and is shown to recover the usual Hodge decomposition on cohomology, the Hodge filtration on the pro-algebraic fundamental group as defined by C.Simpson, and in the simply connected case, the Hodge decomposition on the complexified homotopy groups as defined by J.Morgan and R. Hain. This Hodge decomposition is shown to satisfy a purity property with respect to a weight filtration, generalizing the fact that the higher homotopy groups of a simply connected projective manifold have natural mixed Hodge structures. As a first application we construct a new family of examples of homotopy types which are not realizable as complex projective manifolds. Our second application is a formality theorem for the schematization of a complex projective manifold. Finally, we present conditions on a complex projective manifold $X$ under which the image of the Hurewitz morphism of $pi_{i}(X) to H_{i}(X)$ is a sub-Hodge structure." @default.
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- W2167284212 date "2008-05-01" @default.
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- W2167284212 title "Schematic homotopy types and non-abelian Hodge theory" @default.
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- W2167284212 doi "https://doi.org/10.1112/s0010437x07003351" @default.
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