The Physical Properties of the Cosmic Acceleration

Abstract

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 galaxies the CMB fluctuations as well as the large scale structure formation, to put tight constraints on the different models.

Comments: 6 pages, 1 figure, invited talk in "The 9th Hellenic Astronomical Conference 20-24 September 2009, Athens", The proceedings will be published by (PASP)