It was noted recently that the ADM-diffeomorphism-constraint does not generate all observed symmetries for several Bianchi-models. We will suggest not to use the ADM-constraint restricted toâ€¦ (More)

One can simplify the triad formulations of canonical gravity by abandoning any relation to a fixed coordinate system. That means in case of the adm formalism that one can determine the momentum byâ€¦ (More)

We explicitly construct a star product for the complex Grassmann manifolds using the method of phase space reduction. Functions on C(p+q)Â·p âˆ—, the space of (p + q)Ã— p matrices of rank p, invariantâ€¦ (More)