## Abstract

Given a compact Riemannian manifold (M^{d}, g), a finite dimensional representation ρ:π_{1}(M) → GL(V) of the fundamental group π_{1}(M) on a vector space V of dimension l and a Hermitian structure μ on the flat vector bundle ℰ → ^{p} M associated to ρ, Ray-Singer [RS] have introduced the analytic torsion T = T(M,ρ,g,μ) > 0. Witten's deformation d_{q}(t) of the exterior derivative d_{q}, d_{q}(t) = e^{-ht}d_{q}e^{ht}, with h: M → R a smooth Morse function, can be used to define a deformation T(h, t) > 0 of the analytic torsion T with T(h, 0) = T. The main results of this paper are to provide, assuming that grad _{g}h is Morse Smale, an asymptotic expansion for log T(h, t) for t → ∞ of the form Σ^{d+1}_{j=0} a_{j}t^{j} + b log t + O(1/√t) and to present two different formulae for a_{0}. As an application we obtain a shorter derivation of results due to Ray-Singer [RS], Cheeger [Ch], Müller [Mu1, 2] which, in increasing generality, concern the equality for odd dimensional manifolds of the analytic torsion with the average of the Reidemeister torsion corresponding to the triangulation script capital T sign = (h, g) and the dual triangulation script capital T sign _{script D} = (d-h, g).

Original language | English (US) |
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Pages (from-to) | 320-363 |

Number of pages | 44 |

Journal | Journal of Functional Analysis |

Volume | 137 |

Issue number | 2 |

DOIs | |

State | Published - May 1 1996 |

## ASJC Scopus subject areas

- Analysis