Comparison of Supernovae datasets Constraints on Dark Energy

Abstract

Cosmological measurements suggest that our universe contains a dark energy component. In order to study the dark energy evolution, we constrain a parameterized dark energy equation of state $w(z)=w_0+w_1\frac{z}{1+z}$ using the recent observational datasets: 157 Gold type Ia supernovae and the newly released 182 Gold type Ia supernovae by maximum likelihood method. It is found that the best fit $w(z)$ crosses -1 in the past and the present best fit value of $w(0)<-1$ obtained from 157 Gold type Ia supernovae. The crossing of -1 is not realized and $w_0=-1$ is not ruled out in $1\sigma$ confidence level for the 182 Gold type Ia supernovae. We also find that the range of parameter $w_0$ is wide even in $1\sigma$ confidence level and the best fit $w(z)$ is sensitive to the prior of ${\Omega }_m$.

arXiv commentChinese Physics Letter Vol.24, no.5 2007,1425-1428

References in corpus (18)

• Observational Evidence from Supernovae for an Accelerating Universe and a Cosmological Constant
• Measurements of Omega and Lambda from 42 High-Redshift Supernovae
• First Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Determination of Cosmological Parameters
• The Cosmological Constant and Dark Energy
• Detection of the Baryon Acoustic Peak in the Large-Scale Correlation Function of SDSS Luminous Red Galaxies
• Type Ia Supernova Discoveries at z>1 From the Hubble Space Telescope: Evidence for Past Deceleration and Constraints on Dark Energy Evolution
• Cosmological parameters from CMB and other data: a Monte-Carlo approach
• Quintessence, Cosmic Coincidence, and the Cosmological Constant
• Exploring the Expansion History of the Universe
• Accelerating Universes with Scaling Dark Matter
• Phantom Energy and Cosmic Doomsday
• k-Inflation
• Dark Energy Constraints from the Cosmic Age and Supernova
• Accelerated expansion of the universe driven by tachyonic matter
• Constraints on dark energy from Chandra observations of the largest relaxed galaxy clusters
• The 2dF Galaxy Redshift Survey: The bias of galaxies and the density of the Universe
• Comparison of the Legacy and Gold SnIa Dataset Constraints on Dark Energy Models
• Cosmological parameters from supernova observations: A critical comparison of three data sets

Cited by in corpus (3)

• Constraints on Dark Energy from Galaxy Cluster Gas Mass Fraction versus Redshift data
• Reconstructing Dark Energy Potentials From Parameterized Deceleration Parameters
• Cosmology with an Effective $\Lambda$-Term in Lyra Manifold