Survey on aspherical manifolds

  • Wolfgang Lück (University of Bonn)
Felix-Klein-Hörsaal Universität Leipzig (Leipzig)


We give a survey over aspherical closed manifolds. Aspherical is the purely homotopy theoretic condition that the universal covering is contractible. There are many well-known examples such as closed Riemannian manifolds with non-positive sectional curvature, but also very exotic examples such as closed aspherical manifolds that do not admit a triangulation. We discuss some prominent conjectures, e.g., the Borel Conjecture about the topological rigidity, and the Singer Conjecture about the concentration of L^2-Betti numbers in the middle dimension. The main point is to get a better understanding why the condition aspherical has so many consequences about the topology, geometry, algebra, and analysis about such manifolds.

4/24/24 4/24/24

Felix Klein Colloquium

Universität Leipzig Felix-Klein-Hörsaal

Mirke Olschewski

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Lukasz Grabowski

Leipzig University

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