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

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• Reconstruction of Deceleration Parameters from Recent Cosmic Observations
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• The cosmological constant and dark energy in braneworlds
• Growth Index of DGP Model and Current Growth Rate Data
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• The tension on the cosmological parameters from different observational data
• Cosmological Constraints on the DGP braneworld model with Gamma-ray bursts
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• Probing the cosmic acceleration history and the properties of dark energy from the ESSENCE supernova data with a model independent method
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• Ellipsoidal universe in the brane world
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• The relation between Geometry and Matter in classical and quantum Gravity and Cosmology
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