Applicability of the linearly perturbed FRW metric and Newtonian cosmology

Details Applicability of the linearly perturbed FRW metric and Newtonian cosmology Applicability of the linearly perturbed FRW metric and Newtonian cosmology

2010-02-25

arxiv.org/abs/1002.4779v2

Phys.Rev.D81:103512,2010

Astronomy and Astrophysics

Astrophysics

Cosmology and Extragalactic Astrophysics

24 pages. v2: Published version. Added clarifications and a reference

Scientific paper

10.1103/PhysRevD.81.103512

It has been argued that the effect of cosmological structure formation on the average expansion rate is negligible, because the linear approximation to the metric remains applicable in the regime of non-linear density perturbations. We discuss why the arguments based on the linear theory are not valid. We emphasise the difference between Newtonian gravity and the weak field, small velocity limit of general relativity in the cosmological setting.

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