Duality for graded Lie algebras

Abstract

A well-known and old result of Hazewinkel and Koszul states that the cohomology of a finite-dimensional Lie algebra is isomorphic, up to a suitable shift, to its twisted homology, a Lie-theoretical version of Poincare duality. This paper establishes an analogue of this result for graded (or super) Lie algebras and, more generally, differential graded Lie algebras. Closely related to this result is a calculation of the cohomology of a graded Lie algebra g with coefficients in its universal enveloping algebra U(g) as a one-sided module. This cohomology turns out to be one-dimensional and serves as a dualizing module for the cohomology of g. Moreover, it is shown that for a unimodular graded Lie algebra g, the derived category of U(g) has a Calabi-Yau structure. As a consequence, the category of rational infinity local systems on a simply connected topological space with totally finite-dimensional rational homotopy groups, has a Calabi-Yau structure, a generalization of Poincare duality for elliptic spaces.