Reconstructing dark energy potentials from parameterized deceleration parameters

doi:10.1088/1674-1056/19/1/019801

中国物理B ›› 2010, Vol. 19 ›› Issue (1): 19801-019801.doi: 10.1088/1674-1056/19/1/019801

Reconstructing dark energy potentials from parameterized deceleration parameters

王钰婷, 徐立昕, 吕剑波, 桂元星

School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China

收稿日期:2008-10-18 修回日期:2009-05-20 出版日期:2010-01-15 发布日期:2010-01-15
基金资助:
Project supported by the National Natural Science Foundation of China (Grant Nos. 10573003 and 10703001), and Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20070141034).

Reconstructing dark energy potentials from parameterized deceleration parameters

Wang Yu-Ting(王钰婷), Xu Li-Xin(徐立昕)^†, Lü Jian-Bo(吕剑波), and Gui Yuan-Xing(桂元星)

School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China

Received:2008-10-18 Revised:2009-05-20 Online:2010-01-15 Published:2010-01-15
Supported by:
Project supported by the National Natural Science Foundation of China (Grant Nos. 10573003 and 10703001), and Specialized Research Fund for the Doctoral Program of Higher Education of China (Grant No. 20070141034).

摘要/Abstract

摘要： 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 \varOmega_φ, \varOmega_m, and the state parameter w_φ, 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.

Abstract: 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 $V(\phi)$ and the cosmological parameters, such as the dimensionless energy density $\varOmega_{\phi}$, $\varOmega_m$, and the state parameter $w_{\phi}$, 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 $V(\phi)$ are plotted and analysed. It is found that the potentials run away with the evolution of universe.

Key words: dark energy(DE), deceleration parameter, reconstructed potential

中图分类号: (Dark energy)

95.36.+x

98.80.Cq (Particle-theory and field-theory models of the early Universe (including cosmic pancakes, cosmic strings, chaotic phenomena, inflationary universe, etc.))

王钰婷, 徐立昕, 吕剑波, 桂元星. Reconstructing dark energy potentials from parameterized deceleration parameters[J]. 中国物理B, 2010, 19(1): 19801-019801.

Wang Yu-Ting(王钰婷), Xu Li-Xin(徐立昕), Lü Jian-Bo(吕剑波), and Gui Yuan-Xing(桂元星) . Reconstructing dark energy potentials from parameterized deceleration parameters[J]. Chin. Phys. B, 2010, 19(1): 19801-019801.

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Reconstructing dark energy potentials from parameterized deceleration parameters

Reconstructing dark energy potentials from parameterized deceleration parameters

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