Observational Tests for the Cosmological Principle and World Models

Details Observational Tests for the Cosmological Principle and World Models Observational Tests for the Cosmological Principle and World Models

2000-01-05

arxiv.org/abs/astro-ph/0001061v1

Astronomy and Astrophysics

Astrophysics

Review talk, to appear in the proceedings of the NATO ASI `Structure Formation in the Universe', Isaac Newton Institute, Cambr

Scientific paper

We review observational tests for the homogeneity of the Universe on large scales. Redshift and peculiar velocity surveys, radio sources, the X-Ray Background, the Lyman-$\alpha$ forest and the Cosmic Microwave Background are used to set constraints on inhomogeneous models and in particular on fractal-like models. Assuming the Cosmological Principle and the FRW metric, we estimate cosmological parameters by joint analysis of peculiar velocities, the CMB, cluster abundance, IRAS and Supernovae. Under certain assumptions the best fit density parameter is Omega_m = 1 - lambda \approx 0.4 . We present a new method for joint estimation by combining different data sets in a Bayesian way, and utilising `Hyper-Parameters'.

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