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Homotopy Lie algebras; lower central series and the Koszul property. (English) Zbl 1127.55004

Summary: Let \(X\) and \(Y\) be finite-type CW-complexes (\(X\) connected, \(Y\) simply connected), such that the rational cohomology ring of \(Y\) is a \(k\)-rescaling of the rational cohomology ring of \(X\). Assume \(H^*(X,Q)\) is a Koszul algebra. Then, the homotopy Lie algebra \(\pi_*(\Omega Y)\otimes Q\) equals, up to \(k\)-rescaling, the graded rational Lie algebra associated to the lower central series of \(\pi_1(X)\). If \(Y\) is a formal space, this equality is actually equivalent to the Koszulness of \(H^*(X,Q)\). If \(X\) is formal (and only then), the equality lifts to a filtered isomorphism between the Malcev completion of \(\pi_1(X)\) and the completion of \([\Omega S^{2k+1},\Omega Y]\). Among spaces that admit naturally defined homological rescalings are complements of complex hyperplane arrangements, and complements of classical links. The Rescaling Formula holds for supersolvable arrangements, as well as for links with connected linking graph.

MSC:

55Q15 Whitehead products and generalizations
16S37 Quadratic and Koszul algebras
20F14 Derived series, central series, and generalizations for groups
57M25 Knots and links in the \(3\)-sphere (MSC2010)
57Q45 Knots and links in high dimensions (PL-topology) (MSC2010)
55P62 Rational homotopy theory
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