Expository Remarks on Three-Dimensional Gravity and Hyperbolic   Invariants
  We consider complex invariants associated with compact real three-dimensional hyperbolic spaces. The contribution of the Chern-Simons invariants of irreducible U(n)-flat connections on hyperbolic fibered manifolds to the low order expansion of the quantum gravitational path integral is analyzed. 
A. A. Bytsenko (DF/Uel) and M. E. X. Guimaraes (IF/Uff)