Mathematics – Logic
Scientific paper
May 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003aas...202.2307w&link_type=abstract
American Astronomical Society Meeting 202, #23.07; Bulletin of the American Astronomical Society, Vol. 35, p.728
Mathematics
Logic
Scientific paper
Type Ia supernovae (SNe Ia) provide us with a unique probe into the nature of dark energy in the universe. Different dark energy models can be differentiated phenomenologically by the different time dependences of the dark energy density ρ X, or, alternatively, by the dark energy equation of state wX. Wang & Garnavich (2001, ApJ, 552, 445) have shown that parametrizing the dark energy density ρ X as an arbitrary function of redshift offers some useful advantages when used instead of the more familiar wX formulation. In particular, the time variation of ρ X can be determined from data with smaller uncertainty than that of wX. This is because ρ X is on the same footing as the matter density fraction Ω m in making theoretical predications for the observables, while wX must be integrated over z to obtain ρ X before comparison with data can be made.
In order to determine the time dependence of the dark energy density ρ X, it is important that the supernova survey be optimized for detecting large numbers of supernovae at the highest possible redshifts (Wang & Lovelace 2001, ApJ, 562, L115). A supernova pencil beam survey on a dedicated telescope (Wang 2000, ApJ, 531, 676, astro-ph/9806185) provides the most efficient method to obtain the largest possible number of supernovae at high redshifts. These can be supplemented by surveys of nearby supernovae to constrain dark energy. I will show that data from an optimized supernova pencil beam survey, such as that planned by the proposed SNAP mission, should allow us to determine the basic time dependence of the dark energy density ρ X (Wang et al. 2003, astro-ph/0302064). This would allow us to differentiate among many different classes of dark energy models.
The observational detection of the time variation (or invariance) of the dark energy density ρ X would be an important landmark in particle physics and cosmology.
No associations
LandOfFree
Dark Energy Search Using Type Ia Supernovae does not yet have a rating. At this time, there are no reviews or comments for this scientific paper.
If you have personal experience with Dark Energy Search Using Type Ia Supernovae, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Dark Energy Search Using Type Ia Supernovae will most certainly appreciate the feedback.
Profile ID: LFWR-SCP-O-1367296