Dark energy and cosmic curvature: Monte-Carlo Markov Chain approach

Abstract

We use the Monte-Carlo Markov Chain method to explore the dark energy property and the cosmic curvature by fitting two popular dark energy parameterizations to the observational data. The new 182 gold supernova Ia data and the ESSENCE data both give good constraint on the DE parameters and the cosmic curvature for the dark energy model $w_0+w_{a}z/(1+z)$. The cosmic curvature is found to be $|Ω_k|\la 0.03$. For the dark energy model $w_0+w_{a}z/(1+z{)}^2$, the ESSENCE data gives better constraint on the cosmic curvature and we get $|{\Omega }_k|\le 0.02$.

10 figures, revised version: clarify the marginalization on H_0 and the use of the covariance matrix, accepted for publication in ApJ

References in corpus (13)

• Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology
• Dynamics of dark energy
• New Hubble Space Telescope Discoveries of Type Ia Supernovae at z > 1: Narrowing Constraints on the Early Behavior of Dark Energy
• Observational Constraints on the Nature of the Dark Energy: First Cosmological Results from the ESSENCE Supernova Survey
• WMAP constraints on low redshift evolution of dark energy
• Reconstruction of the deceleration parameter and the equation of state of dark energy
• Dynamical Dark Energy or Simply Cosmic Curvature?
• On using the CMB shift parameter in tests of models of dark energy
• Energy conditions and current acceleration of the universe
• Accelerating cosmologies tested by distance measures
• Implication of Dark Energy Parametrizations on the Determination of the Curvature of the Universe
• Narrowing Constraints with Type Ia Supernovae: Converging on a Cosmological Constant
• Direct evidence of acceleration from distance modulus redshift graph

Cited by in corpus (10)

• Testing the Void against Cosmological data: fitting CMB, BAO, SN and H0
• Growth factor parametrization and modified gravity
• Inflation in a closed universe
• Growth factor parametrization in curved space
• Testing the interaction model with cosmological data and gamma-ray bursts
• $f(R)$ theory and geometric origin of the dark sector in Horava-Lifshitz gravity
• Constraints on dark energy from baryon acoustic peak and galaxy cluster gas mass measurements
• Current cosmological constraints on the curvature, dark energy and modified gravity
• Late transient acceleration of the universe in string theory on $S^1/Z_2$
• Cosmic curvature on large-scale structures with homogeneous dark energy