Astronomy and Astrophysics – Astrophysics
Scientific paper
2006-03-28
Astronomy and Astrophysics
Astrophysics
12 pages, TeX file. Talk given at the Albert Einstein Century International Conference, UNESCO, Paris, France, 18-22 July 2005
Scientific paper
10.1063/1.2399688
The inhomogeneous distribution of matter in the non-linear regime of galaxies, clusters of galaxies and voids is described by an exact, spherically symmetric inhomogeneous solution of Einstein's gravitational field equations, corresponding to an under-dense void. The solution becomes the homogeneous and isotropic Einstein-de Sitter solution for a red shift $z > 10-20$, which describes the matter dominated CMB data with small inhomogeneities. A spatial volume averaging of physical quantities is introduced and the averaged time evolution expansion parameter $\theta$ can give rise in the late-time universe to a volume averaged deceleration parameter $$ that is negative for a positive matter density. This allows for a region of accelerated expansion which does not require a cosmological constant. A negative deceleration parameter can be derived by this volume averaging procedure from the Lema\^{i}tre-Tolman-Bondi open void solution, which describes the late-time non-linear regime associated with galaxies and under-dense voids and solves the ``coincidence'' problem.
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