Accelerating cosmologies tested by distance measures

Abstract

We test if the latest Gold set of 182 SNIa or the combined "Platinum" set of 192 SNIa from the ESSENCE and Gold sets, in conjunction with the CMB shift parameter show a preference between the LambdaCDM model, three wCDM models, and the DGP model of modified gravity as an explanation for the current accelerating phase of the universe's expansion. We consider flat wCDM models with an equation of state w(a) that is (i) constant with scale factor $a$, (ii) varies as w(a)=w_0+w_a(1-a) for redshifts probed by supernovae but is fixed at -1 at earlier epochs and (iii) varies as w_0+w_a(1-a) since recombination. We find that all five models explain the data with comparable success.

15 pages, 7 figures, 1 table. New ESSENCE SN data included

References in corpus (13)

• 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
• Constraints on Holographic Dark Energy from Latest Supernovae, Galaxy Clustering, and Cosmic Microwave Background Anisotropy Observations
• Reconstruction of the deceleration parameter and the equation of state of dark energy
• Probing for dynamics of dark energy and curvature of universe with latest cosmological observations
• Reconstruction of Hessence Dark Energy and the Latest Type Ia Supernovae Gold Dataset
• Bayesian Evidence for a Cosmological Constant using new High-Redshift Supernovae Data
• Confronting pNGB quintessence with data
• Constraints on Dark Energy Models Including Gamma Ray Bursts
• Reconstructing generalized ghost condensate model with dynamical dark energy parametrizations and observational datasets
• Observational Constraints with Recent Data on the DGP Modified Gravity
• Reconstruction of a Deceleration Parameter from the Latest Type Ia Supernovae Gold Dataset
• Comments on an alternative theory for the accelerating universe

Cited by in corpus (20)

• Disappearing cosmological constant in f(R) gravity
• Constraints on Holographic Dark Energy from Latest Supernovae, Galaxy Clustering, and Cosmic Microwave Background Anisotropy Observations
• Holographic Ricci dark energy: Current observational constraints, quintom feature, and the reconstruction of scalar-field dark energy
• Figure of Merit for Dark Energy Constraints from Current Observational Data
• Cosmographic Hubble fits to the supernova data
• The Beginning and Evolution of the Universe
• The cosmological constant and dark energy in braneworlds
• Growth Index of DGP Model and Current Growth Rate Data
• Energy conditions and current acceleration of the universe
• Bayesian Evidence for a Cosmological Constant using new High-Redshift Supernovae Data
• Cosmography: Extracting the Hubble series from the supernova data
• Direct evidence of acceleration from distance modulus redshift graph
• Dark energy and cosmic curvature: Monte-Carlo Markov Chain approach
• Observational Constraints with Recent Data on the DGP Modified Gravity
• Reconstruction of scalar potentials in two-field cosmological models
• The luminosity-redshift relation in brane-worlds: II. Confrontation with experimental data
• The Hubble constant and dark energy from cosmological distance measures
• Probing the cosmic acceleration history and the properties of dark energy from the ESSENCE supernova data with a model independent method
• Constraints on Dark Energy Models from Weak Gravity Conjecture
• Ellipsoidal universe in the brane world