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- W1617138614 abstract "This is partly a survey article on nonabelian Hodge theory, but we also give proofs of results that have only been announced elsewhere. In the introduction we discuss a wide range of recent work on this subject and give some references. In the body of the paper, we discuss Corlette's nonabelian Hodge theorem, Hitchin's quaternionic structure on the moduli space of representations of $pi _1(X)$ (for a compact Kahler manifold $X$), and Deligne's construction of the resulting twistor space. We then mention the interpretation of Deligne's space of $lambda$-connections as the Hodge filtration of the nonabelian de Rham cohomology $M_{DR}(X,G)= H^1(X,G)$. We go on to prove several properties of this Hodge filtration, such as Griffiths transversality and regularity of the Gauss-Manin connection; a local triviality property coming from Goldman and Millson's analysis of the singularities; and a weight property coming from Langton's theory. We construct a compactification of $M_{DR}$ using the Hodge filtration with its weight property. At the end, we define a nonabelian version of the Noether-Lefschetz locus, and prove that it is algebraic if the base of the fibration is compact. We pose the open problem of studying degenerations of nonabelian Hodge structure sufficiently well to be able to prove algebraicity of the Noether-Lefshetz locus even when the base is quasiprojective." @default.
- W1617138614 created "2016-06-24" @default.
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- W1617138614 date "1997-01-01" @default.
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- W1617138614 title "The Hodge filtration on nonabelian cohomology" @default.
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- W1617138614 doi "https://doi.org/10.1090/pspum/062.2/1492538" @default.
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