Science

Understanding the nature of Dark Matter and Dark Energy is one of the most pressing issues in cosmology and fundamental physics. The purpose of the Euclid mission is to study these two cosmological components with high precision, using a space-based weak lensing and BAO survey as its primary science driver. Such a survey will permit to address in addition, galaxy evolution, Milky Way and will provide the community a unique all sky imaging and spectroscopy  legacy survey.

Weak Lensing provides a measure of the distribution of dark matter in the Universe and of the impact of dark energy on the growth of structures. Euclid will also measure Baryon Acoustic Oscillations (BAOs), and in correlation with CMB data the Integrated Sachs Wolfe effect, both imprinted in the three-dimensional distribution of galaxies, as well as Galaxy Cluster counts. The later probes will provide an independent measurement of DarkEnergy and Dark Matter properties.