Institute for Advanced Study/Princeton University Joint Astrophysics Colloquium

Deviations from a uniformly expanding universe are of interest in modern cosmology, most particularly because the amplitude of such peculiar motions measures the strength of gravity on scales of roughly 10-100 Mpc. I will review various recent attempts to measure these velocity effects in leading galaxy surveys, together with new rapid approximate means of generating the simulated universes that are needed in order to extract validated results from the data.