The Cosmic Quartet - Cosmological Parameters of a Smoothed Inhomogeneous Spacetime

Details The Cosmic Quartet - Cosmological Parameters of a Smoothed Inhomogeneous Spacetime The Cosmic Quartet - Cosmological Parameters of a Smoothed Inhomogeneous Spacetime

2003-12-25

arxiv.org/abs/astro-ph/0312621v1

Proc. 12th JGRG conference, Tokyo 2002, Shibata M. et al. (eds.) (2003), 157-161

Astronomy and Astrophysics

Astrophysics

5 pages, LaTeX

Scientific paper

We discuss the relation between `bare' cosmological parameters as the true spatial average characteristics that determine the cosmological model, and the parameters interpreted by observers with a `Friedmannian bias', i.e., within a homogeneous space geometry. We may say that the latter are `dressed' by the smoothed-out geometrical inhomogeneities of the surveyed spatial region. We identify two effects that quantify the difference between `bare' and `dressed' parameters: `curvature backreaction' and `volume effect'. An estimate of the latter is given in terms of a simple geometrical example.

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