Geodesic
Closed 1-forms in topology and geometric group theory
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 65 (2010) no. 1, pp. 143-172
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In this article we describe relations of the topology of closed 1-forms to the group-theoretic invariants of Bieri–Neumann–Strebel–Renz. Starting with a survey, we extend these Sigma invariants to finite CW-complexes and show that many properties of the group-theoretic version have analogous statements. In particular, we show the relation between Sigma invariants and finiteness properties of certain infinite covering spaces. We also discuss applications of these invariants to the Lusternik–Schnirelmann category of a closed 1-form and to the existence of a non-singular closed 1-form in a given cohomology class on a high-dimensional closed manifold. Bibliography: 32 titles.
Keywords: Lusternik–Schnirelmann category, Novikov ring, movability of homology classes.
Mots-clés : Sigma invariants 
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M. Farber; R. Geoghegan; D. Schütz. Closed 1-forms in topology and geometric group theory. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 65 (2010) no. 1, pp. 143-172. http://geodesic.mathdoc.fr/item/RM_2010_65_1_a2/

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