On average properties of inhomogeneous cosmologies

Details On average properties of inhomogeneous cosmologies On average properties of inhomogeneous cosmologies

2000-01-20

arxiv.org/abs/gr-qc/0001056v1

Gen.Rel.Grav.9:306-321,2000

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

LaTeX 16 pages, invited paper, 9th JGRG meeting, Hiroshima 1999

Scientific paper

The present talk summarizes the recently progressed state of a systematic re-evaluation of cosmological models that respect the presence of inhomogeneities. Emphasis is given to identifying the basic steps towards an effective (i.e. spatially averaged) description of structural evolution, also unfolding the various facets of a `smoothed--out' cosmology. We shall highlight some results obtained within Newtonian cosmology, discuss expansion laws in general relativity within a covariant fluid approach, and put forward some promising directions of future research.

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