Περίληψη Ομιλίας:
The observed late-time acceleration of the cosmic expansion constitutes a fundamental problem in modern theoretical physics and cosmology. In an attempt to weight the validity of a large number of dark energy models, I use the recent measurements of the expansion rate of the Universe, the clustering of optical galaxies, the CMB fluctuations as well as the matter density perturbations in order to put constraints on the different cosmological models as well as to test the validity of General Relativity at Cosmological scales.