Orateur
Description
In a LCDM framework, dark energy may be described as a fluid with equation of state parameter equal to -1, and sound velocity equal to 1, while dark matter may be described as a fluid with null pressure and null sound velocity. In this talk we will focus on dark matter allowing a more general fluid description. We will first briefly provide the theoretical framework for this phenomenological approach, and present the results from state-of-the-art cosmological observations. We will then present preliminary Euclid forecasts for this model, showing the power of Euclid to improve our knowledge on dark matter properties, as well as the importance of considering the cross-correlations between cosmological probes when constraining theoretical models.
