Is the CMB shift parameter connected with the growth of cosmological perturbations?

Details Is the CMB shift parameter connected with the growth of cosmological perturbations? Is the CMB shift parameter connected with the growth of cosmological perturbations?

2008-04-10

arxiv.org/abs/0804.1631v1

Mon.Not.Roy.Astron.Soc.387:1126-1130,2008

Astronomy and Astrophysics

Astrophysics

6 pages, 3 figures, Accepted for publication in MNRAS

Scientific paper

10.1111/j.1365-2966.2008.13303.x

We verify numerically that in the context of general relativity (GR), flat models which have the same $\Omega_{\rm m}$ and CMB shift parameter $R$ but different $H(a)$ and $w(a)$ also have very similar (within less than 8%) growth of perturbations even though the dark energy density evolution is quite different. This provides a direct connection between geometrical and dynamical tests of dark energy and may be used as a cosmological test of general relativity.

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