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Deviation from the cosmological constant or systematic errors?
Qi, Shi1,2,3; Lu, Tan1,2; Wang, Fa-Yin4
2009-09-01
Source PublicationMONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume398Issue:1Pages:L78-L82
AbstractIn the work of Qi, Wang & Lu, gamma-ray bursts (GRBs) are used together with an earlier Type Ia supernova (SN Ia) data set to constrain the dark energy equation of state (EOS) in a nearly model-independent way. The improvements made by including GRBs show a slight shift of the dark energy EOS toward w > -1 at redshifts z greater than or similar to 0.5. It is interesting that, when we have more SNe Ia, SNe Ia themselves also show the same trend. Motivated by the fact that both SNe Ia and GRBs seem to prefer a dark energy EOS greater than -1 at redshifts z greater than or similar to 0.5, we perform a careful investigation of this situation, including more careful treatments of measurement errors of GRBs and cross-checking the results by using different ways of including GRBs. We find that the deviation of dark energy from the cosmological constant at redshifts z greater than or similar to 0.5 is large enough that we should pay close attention to it with future observational data. Such a deviation may arise from some biasing systematic errors in the handling of SNe Ia and/or GRBs, or more interestingly from the nature of the dark energy itself.
KeywordSupernovae: General Cosmological Parameters Gamma-rays: Bursts
Subject AreaAstronomy & Astrophysics
WOS HeadingsScience & Technology ; Physical Sciences
DOI10.1111/j.1745-3933.2009.00713.x
WOS KeywordGAMMA-RAY BURSTS ; DIGITAL SKY SURVEY ; DARK ENERGY ; IA SUPERNOVAE ; HUBBLE DIAGRAM ; LIGHT CURVES ; CONSTRAINTS ; GALAXIES ; CFA
Indexed BySCI
Language英语
WOS Research AreaAstronomy & Astrophysics
WOS SubjectAstronomy & Astrophysics
WOS IDWOS:000269136800017
Citation statistics
Cited Times:22[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Identifierhttp://libir.pmo.ac.cn/handle/332002/11046
Collection院士文集_陆埮
Affiliation1.Chinese Acad Sci, Purple Mt Observ, Nanjing 210008, Peoples R China
2.Nanjing Univ, Purple Mt Observ, Joint Ctr Particle Nucl Phys & Cosmol, Nanjing 210093, Peoples R China
3.CAS, Kavli Inst Theoret Phys China, Beijing 100190, Peoples R China
4.Nanjing Univ, Dept Astron, Nanjing 210093, Peoples R China
Recommended Citation
GB/T 7714
Qi, Shi,Lu, Tan,Wang, Fa-Yin. Deviation from the cosmological constant or systematic errors?[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2009,398(1):L78-L82.
APA Qi, Shi,Lu, Tan,&Wang, Fa-Yin.(2009).Deviation from the cosmological constant or systematic errors?.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,398(1),L78-L82.
MLA Qi, Shi,et al."Deviation from the cosmological constant or systematic errors?".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 398.1(2009):L78-L82.
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