Narrowing Constraints with Type Ia Supernovae: Converging on a Cosmological Constant

Details Narrowing Constraints with Type Ia Supernovae: Converging on a Cosmological Constant Narrowing Constraints with Type Ia Supernovae: Converging on a Cosmological Constant

2007-06-26

arxiv.org/abs/0706.3730v1

JCAP0709:004,2007

Astronomy and Astrophysics

Astrophysics

16 pages, 6 figures, submitted to JCAP; A code to estimate binned & uncorrelated w(z) estimates from the supernovae Hubble dia

Scientific paper

10.1088/1475-7516/2007/09/004

We apply a parameterization-independent approach to fitting the dark energy equation-of-state (EOS). Utilizing the latest type Ia supernova data, combined with results from the cosmic microwave background and baryon acoustic oscillations, we find that the dark energy is consistent with a cosmological constant. We establish independent estimates of the evolution of the dark energy EOS by diagonalizing the covariance matrix. We find three independent constraints, which taken together imply that the equation of state is more negative than -0.2 at the 68% confidence level in the redshift range 0 1.2 and rolls to a value of -1 today, and ``thawing'' models where the EOS is near -1 at high redshifts, but rapidly evolves to values greater than -0.85 at z < 0.2. Finally, we propose a parameterization-independent figure-of-merit, to help assess the ability of future surveys to constrain dark energy. While previous figures-of-merit presume specific dark energy parameterizations, we suggest a binning approach to evaluate dark energy constraints with a minimum number of assumptions.

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