Abstract
LetF be a flat vector bundle over a compact Riemannian manifoldM and letf :M → ℝ be a Morse function. Letg F be a smooth Euclidean metric onF, letg F t =e −2tf g F, and letρ RS (t) be the Ray-Singer analytic torsion ofF associated with the metricg F t . Assuming that ∇f satisfies the Morse-Smale transversality conditions, we provide an asymptotic expansion for logρ RS (t) fort→+∞ of the forma 0+a 1 t+blog(t/π)+o(1), where the coefficientb is a half-integer depending only on the Betti numbers ofF. In the case where all the critical values off are rational, we calculate the coefficientsa 0 anda 1 explicitly in terms of the spectral sequence of a filtration associated with the Morse function. These results are obtained as applications of a theorem by Bismut and Zhang.
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The research was supported by grant No. 449/94-1 from the Israel Academy of Sciences and Humanities.
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Braverman, M. Witten deformation of analytic torsion and the spectral sequence of a filtration. Geometric and Functional Analysis 6, 28–50 (1996). https://doi.org/10.1007/BF02246766
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DOI: https://doi.org/10.1007/BF02246766