Global gravitational instability of FLRW backgrounds - interpreting the dark sectors

Details Global gravitational instability of FLRW backgrounds - interpreting the dark sectors Global gravitational instability of FLRW backgrounds - interpreting the dark sectors

2011-03-06

arxiv.org/abs/1103.1146v3

Class.Quant.Grav.28:165004,2011

Astronomy and Astrophysics

Astrophysics

General Relativity and Quantum Cosmology

15 pages, 13 figures, 1 table. Matches published version in CQG

Scientific paper

10.1088/0264-9381/28/16/165004

The standard model of cosmology is based on homogeneous-isotropic solutions of Einstein's equations. These solutions are known to be gravitationally unstable to local inhomogeneous perturbations, commonly described as evolving on a background given by the same solutions. In this picture, the FLRW backgrounds are taken to describe the average over inhomogeneous perturbations for all times. We study in the present article the (in)stability of FLRW dust backgrounds within a class of averaged inhomogeneous cosmologies. We examine the phase portraits of the latter, discuss their fixed points and orbital structure and provide detailed illustrations. We show that FLRW cosmologies are unstable in some relevant cases: averaged models are driven away from them through structure formation and accelerated expansion. We find support for the proposal that the dark components of the FLRW framework may be associated to these instability sectors. Our conclusion is that FLRW cosmologies have to be considered critically as for their role to serve as reliable models for the physical background.

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