Euclid -- The Dark Universe detective

TL;DR

Euclid is a space mission by ESA aiming to map the universe's dark matter and dark energy through extensive optical and infrared surveys, providing precise cosmological measurements and advancing our understanding of the universe's composition.

Contribution

This paper introduces the Euclid mission and its innovative approach to measuring cosmological parameters and exploring dark matter and dark energy.

Findings

Survey of 14,000 square degrees of sky

Over a billion galaxy measurements

Percent-level constraints on Dark Energy parameters

Abstract

Euclid is a recently launched medium-class mission by the European Space Agency (ESA) designed to measure cosmological parameters, test the cosmological standard model, and explore the nature of dark matter and dark energy. To this end, Euclid conducts a survey of up to 14000 square degrees of the extra-galactic sky and obtains optical and near-infrared photometric measurements for more than a billion galaxies as well as near-infrared slitless spectroscopy for more than 35 million galaxies. These observations will be used to estimate galaxy clustering and cosmic shear. It is expected that Euclid will achieve percent-level constraints on the Dark Energy equation of state parameter. The survey will also be exploited with a range of other cosmological probes and prove revolutionary for non-cosmological science.