CERN European Organisation for Nuclear Research

High Energy Physics Group
Cosmology and particle physics

CERN Accelerating science

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Observations of the density of the Universe from stars, to galaxies, galaxy clusters, and even larger structures; observations of the fluctuations in the microwave background. Attempts to describe the observed structure of the Universe in terms of primordial fluctuations of the metric and of the inflaton field. Successes and open problems of the approach; extraction of the relevant cosmological parameters from present and future data.

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