Exploring the Properties of Dark Energy Using Type Ia Supernovae and Other Datasets

Details Exploring the Properties of Dark Energy Using Type Ia Supernovae and Other Datasets Exploring the Properties of Dark Energy Using Type Ia Supernovae and Other Datasets

2006-12-14

arxiv.org/abs/astro-ph/0612381v1

JCAP 0702:011,2007

Astronomy and Astrophysics

Astrophysics

13 pages, 7 figures

Scientific paper

10.1088/1475-7516/2007/02/011

We reconstruct dark energy properties from two complementary supernova datasets -- the newly released Gold+HST sample and SNLS. The results obtained are consistent with standard $\Lambda$CDM model within $2\sigma$ error bars although the Gold+HST data favour evolving dark energy slightly more than SNLS. Using complementary data from baryon acoustic oscillations and the cosmic microwave background to constrain dark energy, we find that our results in this case are strongly dependent on the present value of the matter density $\Omega_m$. Consequently, no firm conclusions regarding constancy or variability of dark energy density can be drawn from these data alone unless the value of $\Omega_m$ is known to an accuracy of a few percent. However, possible variability is significantly restricted if this data is used in conjunction with supernova data.

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