Morse-Novikov critical point theory, Cohn localization and Dirichlet units

M. Farber*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review


In this paper we construct a Universal chain complex, counting zeros of closed 1-forms on a manifold. The Universal complex is a refinement of the well known Novikov complex; it relates the homotopy type of the manifold, after a suitable noncommutative localization, with the numbers of zeros of different indices which may have closed 1-forms within a given cohomology class. The main theorem of the paper generalizes the result of a joint paper with A. Ranicki, which treats the special case of closed 1-forms having integral cohomology classes. The present paper also describes a number of new inequalities, giving topological lower bounds on the minimum number of zeros of closed 1-forms. In particular, such estimates are provided by the homology of flat line bundles with monodromy described by complex numbers, which are not Dirichlet units.

Original languageEnglish
Pages (from-to)467-495
Number of pages29
JournalCommunications in Contemporary Mathematics
Issue number4
StatePublished - Nov 1999


  • Closed 1-forms
  • Cohn localization
  • Morse theory
  • Novikov inequalities


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