Physics & Astronomy Colloquium
3:30 PM, Friday, January 15, 2010
Room 155, Chem-Phys Building
Dr. Josh Frieman
Theoretical Astrophysics Group
Department of Astronomy and Astrophysics
University of Chicago
"Probing Dark Energy: Results from the SDSS-II Supernova Survey''
A decade ago, two teams studying distant Type Ia supernovae discovered that the
expansion of the Universe is speeding up. Since then, supernova surveys from the
ground and from space have brought major improvements in the
quality and quantity of SN Ia data, confirming the discovery of cosmic
acceleration. This talk will focus on the first cosmological results from
the Sloan Digital Sky Survey-II Supernova Survey, which operated for 9 months in
2005-7, discovering and measuring light curves and spectra
for over 500 SNe Ia. I will also discuss the observational challenges to determining
supernova distances for cosmology and how those challenges are being addressed.
These results inform the prospects for using supernovae to obtain improved
cosmology measurements from planned and proposed surveys in the future.
Refreshments will be served in CP 179 at 3:15 PM