A New Equation of State for Dark Energy Model

2012/03/09 by Lei Feng, Tan Lu · 2 citations
Physics and Astronomy · #astro-ph.CO

paper · pdf · doi:10.1088/1475-7516/2011/11/034

published as JCAP11(2011)034 · 5 pages, 3 figures.some statement is changed

arxiv created 2012/03/09 · arxiv updated 2012/03/12

Abstract

A new parameterization for the dark energy equation of state(EoS) is proposed and some of its cosmological consequences are also investigated. This new parameterization is the modification of Efstathiou' dark energy EoS parameterization. w (z) is a well behaved function for z≫1 and has same behavior in z at low redshifts with Efstathiou' parameterization. In this parameterization there are two free parameter w₀ and w_a. We discuss the constraints on this model's parameters from current observational data. The best fit values of the cosmological parameters with 1σ confidence-level regions are: Ω_m=0.2735^+0.0171_-0.0163, w₀=-1.0537^+0.1432_-0.1511 and w_a=0.2738^+0.8018_-0.8288.

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