The Covariant Approach to LRS Perfect Fluid Spacetime Geometries

Details The Covariant Approach to LRS Perfect Fluid Spacetime Geometries The Covariant Approach to LRS Perfect Fluid Spacetime Geometries

1995-10-23

arxiv.org/abs/gr-qc/9510044v1

Class.Quant.Grav. 13 (1996) 1099-1128

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

25 pages, uuencoded/compressed postscript file

Scientific paper

10.1088/0264-9381/13/5/023

The dynamics of perfect fluid spacetime geometries which exhibit {\em Local Rotational Symmetry} (LRS) are reformulated in the language of a $1+\,3$ "threading" decomposition of the spacetime manifold, where covariant fluid and curvature variables are used. This approach presents a neat alternative to the orthonormal frame formalism. The dynamical equations reduce to a set of differential relations between purely scalar quantities. The consistency conditions are worked out in a transparent way. We discuss their various subcases in detail and focus in particular on models with higher symmetries within the class of expanding spatially inhomogeneous LRS models, via a consideration of functional dependencies between the dynamical variables.

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