Jm. Bismut et W. Zhang, MILNOR AND RAY-SINGER METRICS ON THE EQUIVARIANT DETERMINANT OF A FLAT VECTOR BUNDLE, Geometric and functional analysis, 4(2), 1994, pp. 136-212
In this paper, we extend our previous results relating Milnor and Ray-
Singer metrics on the determinant of the cohomology of a flat complex
vector bundle to the equivariant case. Thus, we extend Lott and Rothen
berg and Luck's theorems relating equivariant combinatorial and analyt
ic torsions to flat vector bundles which are not necessarily unitarily
flat.