Testing Homogeneity on Large Scales

Details Testing Homogeneity on Large Scales Testing Homogeneity on Large Scales

1999-11-04

arxiv.org/abs/astro-ph/9911059v1

Astronomy and Astrophysics

Astrophysics

Review talk, to appear in the proceedings of the Cosmic Flows Workshop, Victoria, Canada, July 1999, ed. S. Courteau, M. Strau

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 = 0.3-0.5.

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