Fruits series: Can one learn more from lensing surveys than lensing?

by Björn Malte Schäfer (U Heidelberg)

Thursday 28 May 2015, 12:30 → 13:00 Europe/Berlin

Lounge area, 1st floor (Excellence Cluster Universe)

Weak gravitational lensing is a tool for investigating the large-scale distribution of matter in the universe and for testing cosmological models through their influence on the expansion dynamics of the universe and the evolution of cosmic structures. The signature of gravitational lensing are correlations between the shapes of neighbouring galaxies: their images are distorted in a correlated way because their light reaches us along similar paths with correlated deflection by cosmic structures. There might be, however, intrinsic correlations in the shapes of galaxies due to the galaxy formation process or due to direct interaction of galaxies with ambient cosmic structures. Björn will try to illustrate the two processes and show ways in which future lensing surveys can be used in more than one way. The audience is cordially invited to discuss and comment. During this 30-minutes lunch event of the series "Fruits of the Universe", we will serve drinks and fingerfood.