Euler structures, the variety of representations and the Milnor–Turaev torsion

Burghelea, Dan¹ ; Haller, Stefan²

¹ Dept. of Mathematics, The Ohio State University, 231 West 18th Avenue, Columbus, OH 43210, USA
² Department of Mathematics, University of Vienna, Nordbergstrasse 15, A-1090, Vienna, Austria

Geometry & topology, Tome 10 (2006) no. 2, pp. 1185-1238.

Résumé

In this paper we extend and Poincaré dualize the concept of Euler structures, introduced by Turaev for manifolds with vanishing Euler–Poincaré characteristic, to arbitrary manifolds. We use the Poincaré dual concept, co-Euler structures, to remove all geometric ambiguities from the Ray–Singer torsion by providing a slightly modified object which is a topological invariant. We show that when the co-Euler structure is integral then the modified Ray–Singer torsion when regarded as a function on the variety of generically acyclic complex representations of the fundamental group of the manifold is the absolute value of a rational function which we call in this paper the Milnor–Turaev torsion.

Détail

DOI : 10.2140/gt.2006.10.1185

Keywords: Euler structure, co-Euler structure, combinatorial torsion, analytic torsion, theorem of Bismut–Zhang, Chern–Simons theory, geometric regularization, mapping torus, rational function

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