Parametric Manifolds I: Extrinsic Approach

Details Parametric Manifolds I: Extrinsic Approach Parametric Manifolds I: Extrinsic Approach

1994-07-12

arxiv.org/abs/gr-qc/9407011v1

J.Math.Phys. 36 (1995) 1378-1393

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

Plain TeX, 21 pages, no figures

Scientific paper

10.1063/1.531127

A parametric manifold can be viewed as the manifold of orbits of a (regular) foliation of a manifold by means of a family of curves. If the foliation is hypersurface orthogonal, the parametric manifold is equivalent to the 1-parameter family of hypersurfaces orthogonal to the curves, each of which inherits a metric and connection from the original manifold via orthogonal projections; this is the well-known Gauss-Codazzi formalism. We generalize this formalism to the case where the foliation is not hypersurface orthogonal. Crucial to this generalization is the notion of deficiency, which measures the failure of the orthogonal tangent spaces to be surface-forming, and which behaves very much like torsion. Some applications to initial value problems in general relativity will be briefly discussed.

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