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Features in the dark energy equation of state and modulations in the Hubble diagram
Xia JQ(夏俊卿); Zhao GB(赵公博); Li H(李虹); Zhang XM(张新民); Xia, JQ; Zhao, GB; Li, H; Feng, B; Zhang, XM
Source PublicationPHYSICAL REVIEW D
Corresponding AuthorChinese Acad Sci, Inst High Energy Phys, Beijing 100049, Peoples R China ; Univ Tokyo, Grad Sch Sci, Res Ctr Early Universe, Tokyo 1130033, Japan
AbstractWe probe the time dependence of the dark energy equation of state (EOS) in light of three-year WMAP (WMAP3) and the combination with other tentative cosmological observations from galaxy clustering (SDSS) and Type Ia Supernova (SNIa). We mainly focus on cases where the EOS is oscillating or with local bumps. By performing a global analysis with the Markov Chain Monte Carlo (MCMC) method, we find the current observations, in particular, the WMAP3 + SDSS data combination, allow large oscillations of the EOS which can leave oscillating features on the (residual) Hubble diagram, and such oscillations are potentially detectable by future observations like SNAP, or even by the currently ongoing SNIa observations. Local bumps of dark energy EOS can also leave imprints on CMB, LSS and SNIa. In cases where the bumps take place at low redshifts and the effective EOS is close to -1, CMB and LSS observations cannot give stringent constraints on such possibilities. However, geometrical observations like (future) SNIa can possibly detect such features. On the other hand when the local bumps take place at higher redshifts beyond the detectability of SNIa, future precise observations like Gamma-ray bursts, CMB and LSS may possibly detect such features. In particular, we find that bumplike dark energy EOS on high redshifts might be responsible for the localized features of WMAP on ranges l similar to 20-40, which is interesting and deserves addressing further.
Subject AreaAstronomy & Astrophysics; Physics
WOS Research AreaAstronomy & Astrophysics ; Physics
WOS SubjectAstronomy & Astrophysics ; Physics, Particles & Fields
WOS IDWOS:000241724000038
ADS Bibcode2006PhRvD..74h3521X
ADS URLhttps://ui.adsabs.harvard.edu/abs/2006PhRvD..74h3521X
ADS CITATIONShttps://ui.adsabs.harvard.edu/abs/2006PhRvD..74h3521X/citations
Citation statistics
Cited Times:53 [INSPIRE]
Cited Times:58 [ADS]
Document Type期刊论文
First Author AffilicationInstitute of High Energy
Recommended Citation
GB/T 7714
Xia JQ,Zhao GB,Li H,et al. Features in the dark energy equation of state and modulations in the Hubble diagram[J]. PHYSICAL REVIEW D,2006,74(8):83521.
APA 夏俊卿.,赵公博.,李虹.,张新民.,Xia, JQ.,...&Zhang, XM.(2006).Features in the dark energy equation of state and modulations in the Hubble diagram.PHYSICAL REVIEW D,74(8),83521.
MLA 夏俊卿,et al."Features in the dark energy equation of state and modulations in the Hubble diagram".PHYSICAL REVIEW D 74.8(2006):83521.
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