Covariant gauge fixing and Kuchar decomposition

Details Covariant gauge fixing and Kuchar decomposition Covariant gauge fixing and Kuchar decomposition

1999-08-18

arxiv.org/abs/gr-qc/9908051v1

Phys.Rev. D61 (2000) 024037

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Revtex, 35 pages, no figures

Scientific paper

10.1103/PhysRevD.61.024037

The symplectic geometry of a broad class of generally covariant models is studied. The class is restricted so that the gauge group of the models coincides with the Bergmann-Komar group and the analysis can focus on the general covariance. A geometrical definition of gauge fixing at the constraint manifold is given; it is equivalent to a definition of a background (spacetime) manifold for each topological sector of a model. Every gauge fixing defines a decomposition of the constraint manifold into the physical phase space and the space of embeddings of the Cauchy manifold into the background manifold (Kuchar decomposition). Extensions of every gauge fixing and the associated Kuchar decomposition to a neighbourhood of the constraint manifold are shown to exist.

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