Talk Details

Monday, April 11, 2011 - 11:20am

Mathias Bartelmann:

"Two problems with galaxy clusters"

Abstract. Galaxy clusters seem to be well understood, individually and as a population, but their gravitational lensing effects reveal problems that are hard to tackle. As strong lenses, they seem to be substantially more efficient than they should be according to standard simulations. I shall summarise the evidence for the problems and sketch what we hope will a way towards their solution.