Circle-valued Morse theory, Reidemeister torsion, and Seiberg-Witten invariants of 3-manifolds

Details Circle-valued Morse theory, Reidemeister torsion, and Seiberg-Witten invariants of 3-manifolds Circle-valued Morse theory, Reidemeister torsion, and Seiberg-Witten invariants of 3-manifolds

1996-12-03

arxiv.org/abs/dg-ga/9612004v1

Mathematics

Differential Geometry

35 pages, AMS-LaTeX (one hand-drawn figure available on request)

Scientific paper

Let X be a compact oriented Riemannian manifold and let $\phi:X\to S^1$ be a circle-valued Morse function. Under some mild assumptions on $\phi$, we prove a formula relating: (a) the number of closed orbits of the gradient flow of $\phi$ of any given degree; (b) the torsion of a ``Morse complex'', which counts gradient flow lines between critical points of $\phi$; and (c) a kind of Reidemeister torsion of X determined by the homotopy class of $\phi$. When $\dim(X)=3$ and $b_1(X)>0$, we state a conjecture analogous to Taubes's ``SW=Gromov'' theorem, and we use it to deduce (for closed manifolds, modulo signs) the Meng-Taubes relation between the Seiberg- Witten invariants and the ``Milnor torsion'' of X.

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