Triad formulations of Canonical Gravity without a fixed reference frame

Details Triad formulations of Canonical Gravity without a fixed reference frame Triad formulations of Canonical Gravity without a fixed reference frame

1995-03-22

arxiv.org/abs/gr-qc/9503037v1

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

35 pages, LaTeX

Scientific paper

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 by direct derivation of the Lagrange-3-form w.r.t the time-derivative of the triad-1-forms, thus the momentum is most naturally a 2-form. We apply this concept to the Palatini formulation where we can closely follow Dirac's concept to find and eliminate the second class constraints. Following the same way for the Ashtekar theory it will turn out to be equivalent to two successive canonical transformations where the first makes explicit use of the spatial dimension being 3 and the second is usually hidden in the use of densities. At the end we can give a simple version of the reality constraints.

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