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The effects of parametrization of the dark energy equation of state
Shi, Ke1,2; Huang, Yong-Feng1,2; Lu, Tan3,4
2011-12-01
Source PublicationRESEARCH IN ASTRONOMY AND ASTROPHYSICS
Volume11Issue:12Pages:1403-1412
AbstractWe investigate in detail the influence of parametrizations of the dark energy equation of state on reconstructing dark energy geometrical parameters, such as the deceleration parameter q(z) and Om diagnostic. We use a type Ia supernova sample, baryon acoustic oscillation data, cosmic microwave background information along with twelve observational Hubble data points to constrain cosmological parameters. With the joint analysis of these current datasets, we find that the parametrizations of w(z) have little influence on the reconstruction result of q(z) and OM. The same is true for the transition (cosmic deceleration to acceleration) redshift z(t), for which we find that for different parametrizations of w(z), the best fitted values of zt are very close to each other (about 0.65). All of our results are in good agreement with the ACDM model. Furthermore, using the combination of datasets, we do not find any signal of decreasing cosmic acceleration as suggested in some recent papers. The results suggest that the influence of the prior w(z) is not as severe as one may anticipate, and thus we can, to some extent, safely use a reasonable parametrization of w(z) to reconstruct some other dark energy parameters (e.g. q(z), Om) with a combination of datasets.
KeywordCosmology: Observations Cosmology: Cosmological Parameters
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
WOS KeywordPROBE WMAP OBSERVATIONS ; COSMOLOGICAL CONSTANT ; QUINTESSENCE ; SUPERNOVAE ; REDSHIFT ; CONSTRAINTS ; PARAMETERS ; COMPONENT ; DYNAMICS ; UNIVERSE
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000298341000003
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Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/11051
Collection院士文集_陆埮
Affiliation1.Nanjing Univ, Dept Astron, Nanjing 210093, Jiangsu, Peoples R China
2.Nanjing Univ, Key Lab Modern Astron & Astrophys, Nanjing 210093, Jiangsu, Peoples R China
3.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Jiangsu, Peoples R China
4.Nanjing Univ, Purple Mt Observ, Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Jiangsu, Peoples R China
Recommended Citation
GB/T 7714
Shi, Ke,Huang, Yong-Feng,Lu, Tan. The effects of parametrization of the dark energy equation of state[J]. RESEARCH IN ASTRONOMY AND ASTROPHYSICS,2011,11(12):1403-1412.
APA Shi, Ke,Huang, Yong-Feng,&Lu, Tan.(2011).The effects of parametrization of the dark energy equation of state.RESEARCH IN ASTRONOMY AND ASTROPHYSICS,11(12),1403-1412.
MLA Shi, Ke,et al."The effects of parametrization of the dark energy equation of state".RESEARCH IN ASTRONOMY AND ASTROPHYSICS 11.12(2011):1403-1412.
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