Institute for Advanced Study Astrophysics Seminar

ABSTRACT: Through their census, internal structure, and substructure, galaxy clusters encode signatures of the expansion history of the universe, and basic properties of the dark matter particle. I will present early work on systematic multi-wavelength studies of galaxy clusters recently discovered at redshifts beyond one, and recent quantitative cluster structure results from the Multi-Cycle program Cluster Lensing And Supernova Survey with Hubble (CLASH). I will discuss possible sources of systematic error, and if these are understood, how these results may lend unique insight now (or in the near future) on the nature of dark energy, and dark matter.