Time: 　
　  2pm, Tuesday, 8 June

Abstract: 　

　  In the 12 years since discovery of the acceleration of the universe,　great developments have been made in cosmological observations and great numbers of theories have proliferated to explain the dark energy causing the speed-up.　I discuss the most recent data and what we might expect in the future.　For the present, I show that the observed behavior near to Einstein's cosmological constant can result from a wide variety of different physics from quantum fields to new gravity to microphysics. 　
　  For the future, I explore how mapping the three-dimensional galaxy distribution can test cosmology and gravity with an advanced ground-based survey, BigBOSS.