Extended Bloch group and the Chern-Simons class (Incomplete working version)
Abstract
We define an extended Bloch group and show it is isomorphic to H3(PSL(2,C)δ;Z). Using the Rogers dilogarithm function this leads to an exact simplicial formula for the universal Cheeger-Simons class on this homology group. It also leads to an independent proof of the analytic relationship between volume and Chern-Simons invariant of hyperbolic manifolds conjectured in neumann-zagier and proved in yoshida, as well as an effective formula for the Chern-Simons invariant of a hyperbolic manifold.
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