ESSENCE: Constraining Properties of the Dark Energy with Supernovae

Details ESSENCE: Constraining Properties of the Dark Energy with Supernovae ESSENCE: Constraining Properties of the Dark Energy with Supernovae

Dec 2002

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002aas...201.7809g&link_type=abstract

American Astronomical Society, 201st AAS Meeting, #78.09; Bulletin of the American Astronomical Society, Vol. 34, p.1233

Mathematics

Logic

10

Scientific paper

The Universe is apparently dominated by a mysterious dark energy which is driving an accelerating expansion. Evidence for the acceleration was first seen in the faintness of high-redshift Type-Ia supernovae (SN) which are superb distance indicators, providing a relative accuracy of 7%. Type-Ia SN have already constrained the nature of the dark energy: cosmic acceleration requires that the mysterious energy have a negative pressure comparable in amplitude to its energy density. The ratio of the pressure to energy density is called the Equation of State (ES) or w and refining the estimate of w provides the best way to differentiate between proliferating models of the dark energy. A vacuum energy or cosmological constant would have a fixed ES of exactly -1, while dynamical theories such has a quintessence or k-essence have a time-varying ES with w>-1. More exotic theories have been developed where the ES can even be less than -1. Project ESSENCE will place tight limits on the value of the cosmic equation of state. Using the CTIO 4m telescope and large-field Mosaic imager, we will discover and study more than 200 Type Ia SN at redshifts between 0.2

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