Reconstructing dark energy potentials from parameterized deceleration parameters

• Published in: Chinese physics B Vol. 19; no. 1; pp. 595 - 599
• Main Author: 王钰婷 徐立昕 吕剑波 桂元星
• Format: Journal Article
• Language: English
• Published: IOP Publishing 2010
• Subjects: 参数化; 宇宙加速膨胀; 宇宙学参数; 无量纲; 暗能量; 状态参数; 能量密度
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/19/1/019801

In this paper, the properties of dark energy are investigated according to the parameterized deceleration parameter q（z）, which is used to describe the extent of the accelerating expansion of the universe. The potential of dark energy V（φ） and the cosmological parameters, such as the dimensionless energy density Ωφ, Ωm, and the state parameter wφ, are connected to it. Concretely, by giving two kinds of parameterized deceleration parameters q（z） = a ＋ bz/（1 ＋ z） and q（z） = 1/2 ＋ （az ＋ b）/（1 ＋ z）^2, the evolution of these parameters and the reconstructed potentials V（φ） are plotted and analysed. It is found that the potentials run away with the evolution of universe.