Massimo Meneghetti
Strong lensing by galaxy clusters: a tool for cosmology

Galaxy clusters are the largest bound structures and therefore the most powerful gravitational lenses in the universe. The images of background galaxies, highly distorted by the lensing effects, are useful to study the matter content in the cluster cores as well as to constrain the geometry of the universe. Moreover, the observed abundance of gravitational arcs depends on cosmological parameters, like the matter density of the universe and the equation of state of the dark energy. In this talk I will discuss the application of arc statistics in cosmology and its sensitivity to cluster mergers. Then I will show how the geometry of the universe can be constrained using multiple arc systems. Finally, I will discuss how strong lensing features and stellar dynamics can be used jointly to investigate the inner structure of cluster density profiles.