Title: Gravitational lensing: studying the dark universe with light rays.
Speaker: Koen Kuiken, Sterrenwacht Leiden

Abstract: All images of the distant universe we observe are distorted by gravitational lensing: the bending of light rays by gravitational fields. I will explain how gravitational lensing can be used to determine cosmological parameters as well as properties of galaxies, and describe how this will be done with the largest of the ESO public imaging surveys, KiDS.