A new equation of state for dark energy model

作者：Feng, Lei^*; Lu, Tan

来源：Journal of Cosmology and Astroparticle Physics, 2011, (11): 034.

DOI：10.1088/1475-7516/2011/11/034

• dark energy theory
• dark energy experiments

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 w(0) 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 la confidence-level regions are: Omega(m) = 0.2735(-0.0163)(+0.0171) w(0) = -1.0537(-0.1511)(+0.1432) and w(a) = 0.2738(-0.8288)(+0.8018).

• 出版日期2011-11
• 单位中国科学院紫金山天文台; 南京大学