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UID:UW-Physics-Event-3910
DTSTART:20160415T203000Z
DTEND:20160415T213000Z
DTSTAMP:20260419T110930Z
LAST-MODIFIED:20160330T191424Z
LOCATION:2241 Chamberlin Hall
SUMMARY:Probing the Accelerating Universe with the Dark Energy Survey\
 , Physics Department Colloquium\, Josh Frieman\, Fermilab and the Univ
 ersity of Chicago
DESCRIPTION:The Nobel Prize in Physics for 2011 was awarded for the di
 scovery that the expansion of the Universe is accelerating. Yet the ph
 ysical origin of cosmic acceleration remains a mystery. The Dark Energ
 y Survey (DES) aims to address the questions: why is the expansion spe
 eding up? Is cosmic acceleration due to dark energy or does it require
  a modification of General Relativity? If dark energy\, is it the ener
 gy density of the vacuum (Einstein's cosmological constant) or somethi
 ng else? DES is addressing these questions by measuring the history of
  cosmic expansion and of the growth of structure through four compleme
 ntary techniques: galaxy clusters\, the large-scale galaxy distributio
 n\, weak gravitational lensing\, and supernovae. The DES collaboration
  built a new\, 570-megapixel\, digital camera for the Blanco 4-meter t
 elescope at Cerro Tololo Inter-American Observatory in Chile to carry 
 out a deep\, wide-area sky survey of 300 million galaxies and a time-d
 omain survey that will discover several thousand supernovae. I will ov
 erview the DES project\, which achieved `first light' in September 201
 2 and which recently completed its third of five survey seasons\,  and
  will describe a number of early science results from the solar system
  to distant quasars.
URL:https://www.physics.wisc.edu/events/?id=3910
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