Algebraic models of Poincare embeddings

Details Algebraic models of Poincare embeddings Algebraic models of Poincare embeddings

2005-03-25

arxiv.org/abs/math/0503605v1

Algebr. Geom. Topol. 5 (2005) 135-182

Mathematics

Algebraic Topology

Published by Algebraic and Geometric Topology at http://www.maths.warwick.ac.uk/agt/AGTVol5/agt-5-9.abs.html

Scientific paper

Let f: P-->W be an embedding of a compact polyhedron in a closed oriented manifold W, let T be a regular neighborhood of P in W and let C:=closure(W-T) be its complement. Then W is the homotopy push-out of a diagram C<--dT-->P. This homotopy push-out square is an example of what is called a Poincare embedding. We study how to construct algebraic models, in particular in the sense of Sullivan, of that homotopy push-out from a model of the map f. When the codimension is high enough this allows us to completely determine the rational homotopy type of the complement C = W-f(P). Moreover we construct examples to show that our restriction on the codimension is sharp. Without restriction on the codimension we also give differentiable modules models of Poincare embeddings and we deduce a refinement of the classical Lefschetz duality theorem, giving information on the algebra structure of the cohomology of the complement.

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