"Lectures on Witten Helffer Sj\""ostrand Theory"

Abstract: Witten- Helffer-Sj"ostrand theory is a considerable addition to the De Rham- Hodge theory for Riemannian manifolds and can serve as a general tool to prove results about comparison of numerical invariants associated to compact manifolds analytically, i.e. by using a Riemannian metric, or combinatorially, i.e by using a triangulation. In this presentation a triangulation, or a partition of a smooth manifold in cells, will be viewed in a more analytic spirit, being provided by the stable manifolds of the gradient of a nice Morse function. WHS theory was recently used both for providing new proofs for known but difficult results in topology, as well as new results and a positive solution for an important conjecture about

L_{2} -

torsion, cf [BFKM]. This presentation is a short version of a one quarter course I have given during the spring of 1997 at OSU.

Mathematics Subject Classification ID

Integration on manifolds; measures on manifolds (58C35) Critical points and critical submanifolds in differential topology (57R70) Sequences, series, summability (40-XX) Field theory and polynomials (12-XX)

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