On the homotopy Lie algebra of an arrangement

Details On the homotopy Lie algebra of an arrangement On the homotopy Lie algebra of an arrangement

2005-02-19

arxiv.org/abs/math/0502417v2

Michigan Mathematical Journal 54 (2006), no. 2, 319-340

Mathematics

Algebraic Topology

20 pages; accepted for publication by the Michigan Math. Journal

Scientific paper

10.1307/mmj/1156345597

Let A be a graded-commutative, connected k-algebra generated in degree 1. The homotopy Lie algebra g_A is defined to be the Lie algebra of primitives of the Yoneda algebra, Ext_A(k,k). Under certain homological assumptions on A and its quadratic closure, we express g_A as a semi-direct product of the well-understood holonomy Lie algebra h_A with a certain h_A-module. This allows us to compute the homotopy Lie algebra associated to the cohomology ring of the complement of a complex hyperplane arrangement, provided some combinatorial assumptions are satisfied. As an application, we give examples of hyperplane arrangements whose complements have the same Poincar\'e polynomial, the same fundamental group, and the same holonomy Lie algebra, yet different homotopy Lie algebras.

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