Cosmology and Astrophysics with Exact Inhomogeneous Models

Astronomy and Astrophysics – Astrophysics

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Scientific paper

It is commonly stated that we have entered the era of precision cosmology. The successes of the Concordance model are built on using a homogeneous background metric combined with first order perturbation theory. However, as we map out the universe around us --- its mass distribution and flow patterns --- in ever greater detail, the non-linear behaviour of cosmic structures becomes increasingly apparent. The homogeneity assumption --- so essential in developing the basics of cosmology --- must now be considered just a zeroth order approximation, and similarly linear perturbation theory a first order approximation. Since inhomogeneous solutions of Einstein's field equations provide models of both small and large structures that are fully non-linear, they seem to be best appropriate to properly interpret observations. We give here some instructive examples pertaining to inhomogeneous astrophysics and cosmology, from structure formation to the reproduction of cosmological data.

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