Mathematics – Logic
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...209.9011m&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #90.11; Bulletin of the American Astronomical Society, V
Mathematics
Logic
Scientific paper
The nature of dark energy is a key question in modern cosmology, with current efforts focused on measuring its equation of state parameter, w, as a means to discriminate between the cosmological constant and other possible models for dark energy. The ESSENCE survey is an ongoing six year effort to use high-redshift (0.2 < z < 0.8) supernovae to probe the expansion rate of the universe and constrain w to 10%. We present here constraints from analysis of 65 supernovae from the first four years of ESSENCE data, which, combined with constraints from baryonic acoustic oscillations, show good agreement with the current concordance cosmology. We also present a detailed systematic error budget. While the current constraints are dominated by statistical error, as the sample grows, our ability to constrain dark energy will depend on mastering systematic uncertainties, such as the treatment of extinction in supernova host galaxies. We describe progress towards reducing systematic uncertainties, including novel improvements to the art of calibration.
ESSENCE Team
Miknaitis Gajus A.
Wood-Vasey W.
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