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SUMMARY:Measuring the Expansion of the Universe - Wendy Freedman (Observat
 ories of the Carnegie Institution of Washington)
DTSTART:20091008T153000Z
DTEND:20091008T163000Z
UID:TALK39797@talks.cam.ac.uk
CONTACT:Richard McMahon
DESCRIPTION:Cosmology is at an interesting juncture. In the past century\,
  astronomers obtained the first complete census of the mass and energy in 
 the universe. We learned that the universe is composed of about one third 
 matter\, while two thirds is in a new mysterious form that astronomers ref
 er to as dark energy. This dark energy is causing the universe to accelera
 te in its expansion. I will discuss measurements of cosmological parameter
 s\, with particular focus on measurements of the dark energy and the Hubbl
 e constant\, the current expansion rate of the universe. I will give an up
 date on the status of the Carnegie Supernova Program\, a long-term project
  to follow up type I supernovae with photometry at many wavelengths and sp
 ectroscopy out to redshifts of 0.7. Finally\, I will discuss a new project
  to improve the accuracy of the Hubble constant based on new mid-infrared 
 measurements of distances using the Spitzer satellite.
LOCATION:Sackler Lecture Theatre\, IoA (tea at 4.00 pm)
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