Reconstructing dark energy potentials from parameterized deceleration parameters

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 e...

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Published inChinese 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
LanguageEnglish
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
Online AccessGet full text
ISSN1674-1056
2058-3834
DOI10.1088/1674-1056/19/1/019801

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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（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.
AbstractList 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.
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() and the cosmological parameters, such as the dimensionless energy density omegao, Omegam, and the state parameter w, 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() are plotted and analysed. It is found that the potentials run away with the evolution of universe.
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() and the cosmological parameters, such as the dimensionless energy density Delta *wo, Delta *Wm, and the state parameter w, 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() are plotted and analysed. It is found that the potentials run away with the evolution of universe.
Author 王钰婷 徐立昕 吕剑波 桂元星
AuthorAffiliation School of Physics and Optoelectronic Technology, Dalian University of Technology, Dalian 116024, China
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Snippet In this paper, the properties of dark energy are investigated according to the parameterized deceleration parameter q（z）, which is used to describe the...
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...
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SubjectTerms 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
Title Reconstructing dark energy potentials from parameterized deceleration parameters
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