Other
Scientific paper
Oct 1996
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aihs...65..273b&link_type=abstract
Ann. Inst. Henri Poincaré, Phys. Théor., Vol. 65, No. 3, p. 273 - 309
Other
Cosmology: Robertson-Walker Metric
Scientific paper
A new covariant and gauge-invariant treatment of perturbations, which is applicable to the case of an almost-Robertson-Walker universe dominated by a general perfect fluid with two essential thermodynamic variables, is presented. Beginning from the geometrical foundation, this paper proposes to define gauge-invariant perturbations as the equivalence classes of tangents to one-parameter families of exact solutions of the nonlinear field equations. A simple example illustrating the above result is given and elementary comparisons with other covariant and gauge-invariant approaches are also made. Finally, the paper discusses several new features associated with the so-called scalar perturbation theory.
Banach Zbigniew
Piekarski Slawomir
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