Orateur
Description
Recent cosmological measurements have suggested that the dark energy density might not be constant but evolving. In this study, we explored the interplay between the properties of dark energy and the physical processes responsible for the formation of galaxies which has remained poorly explored. We carried out the analysis on merger trees generated from a semi-analytical approach based on the Excursion Set, using four different dark energy models. We find that the equation of state parameter for dark energy has a clear impact on the formation and growth of galaxies. Typically, quintessence models of dark energy are the most structured, i.e, they form evolved galaxies earlier. Quite the opposite, phantom models of dark energy are the least structured, i.e, form structures later. Dynamical models of dark energy on the other hand remain close to $\Lambda$CDM, even though they are slightly more structured. These predictions motivate further investigations using cosmological simulations, that will enable a more in-depth analysis of the effect of dark energy on the formation and evolution of galaxies.