Speaker: David Schlegel, UC Berkeley
Dark Energy from the Largest Galaxy Maps
Abstract: Dark energy is a phenomena causing the Universe to expand more
rapidly than can be explained by Einstein's laws of gravity. Its discovery
merited the 2011 Nobel Prize in Physics.
The effects of dark energy imprint on large galaxy maps. The Baryon
Oscillation Spectroscopic Survey (BOSS) on the Sloan Telescope has
mapped 200 million galaxies in 2-D, and 1.5 million galaxies and quasars
in 3-D. We measure the scale of the universe to percent-level precision at
redshifts z=2.4, z=0.6 and z=0.3, from the deceleration to acceleration
driven by dark energy. Recent maps are consistent with the "simplest"
modification of Einstein's laws, the additional of a cosmological constant.
When & Where
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