Cosmological constraints from radial baryon acoustic oscillation measurements and observational Hubble data

Zhai, Zhongxu; Wan, Huawei; Zhang, Tong-Jie

doi:10.1016/j.physletb.2010.04.040

Cited by 18 publications

(15 citation statements)

References 56 publications

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“…We also find that the H ( z ) data can give more stringent constraints on the phenomenological interacting scenario when combined with CMB and BAO observations. Comparing the SNe Ia data in the same way, we can find that the confidence regions of H ( z )+BAO+CMB data are in good agreement with those of SNe Ia+BAO+CMB data; this situation has also been noted in Zhai et al (2010) for constraining the ΛCDM and XCDM scenarios. We also find that the confidence regions of H ( z )+BAO+CMB, SNe+BAO+CMB and H ( z )+SNe+BAO+CMB are consistent with each other.…”

Section: Constraint On the Phenomenological Interacting Scenariosupporting

confidence: 75%

“…In order to examine the role of the H ( z ) data played in cosmological constraints, we compared the SNe Ia data in the same way and find that the constraints with H ( z )+BAO+CMB, SNe Ia+BAO+CMB and H ( z )+SNe+BAO+CMB combinations are consistent with each other. With a large amount of the observational H ( z ) data in the future, it is reasonable to expect that the observational H ( z ) data will play an increasingly important role in cosmological research (Zhai et al 2010; Ma & Zhang 2011).…”

Section: Discussionmentioning

confidence: 99%

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Testing the phenomenological interacting dark energy with observational H(z) data

Cao

Liang

Zhu

2011

Monthly Notices of the Royal Astronomical Society

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In order to test the possible interaction between dark energy and dark matter, we investigate observational constraints on a phenomenological scenario, in which the ratio between the dark energy and matter densities is proportional to the power‐law case of the scalefactor, r≡ (ρX/ρm) ∝aξ. By using the Markov chain Monte Carlo method, we constrain the phenomenological interacting dark energy model with the newly revised H(z) data, as well as the cosmic microwave background (CMB) observation from the 7‐year Wilkinson Microwave Anisotropy Probe (WMAP7) results, the baryonic acoustic oscillation (BAO) observation from the spectroscopic Sloan Digital Sky Survey (SDSS) Data Release 7 (DR7) galaxy sample and the Type Ia supernovae (SNe Ia) from the Union2 set. The best‐fitting values of the model parameters are Ωm0= 0.27+0.02−0.02 (1σ)+0.04−0.03 (2σ), ξ= 3.15+0.48−0.50(1σ)+0.72−0.71(2σ) and wX=−1.05+0.15−0.14(1σ)+0.21−0.21(2σ), which are more stringent than previous results. These results show that the standard Λ cold dark matter (ΛCDM) model without any interaction remains a good fit to the recent observational data; however, the interaction that the energy transferring from dark matter to dark energy is slightly favoured over the interaction from dark energy to dark matter. It is also shown that the H(z) data can give more stringent constraints on the phenomenological interacting scenario when combined with CMB and BAO observations, and the confidence regions of H(z)+BAO+CMB, SNe+BAO+CMB and H(z)+SNe+BAO+CMB combinations are consistent with each other.

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Section: Constraint On the Phenomenological Interacting Scenariosupporting

confidence: 75%

Section: Discussionmentioning

confidence: 99%

Testing the phenomenological interacting dark energy with observational H(z) data

Cao

Liang

Zhu

2011

Monthly Notices of the Royal Astronomical Society

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“…As noted by Figueroa et al [72], datasets of different physical natures and systematic effects can be safely combined only if they agree with each other well (see also [93]). In this regard, we note that there is possibly some tension between H(z) and type Ia supernova (SNIa) luminosity distances as shown in [92] (see Figure 6). However, this apparent tension could be statistical in nature and may simply be a consequence of not having enough independent measurements of H(z).…”

Section: Observational Hubble Parameter As a Cosmological Testmentioning

confidence: 93%

Constraints on the Dark Side of the Universe and Observational Hubble Parameter Data

Zhang

Lan

2010

Advances in Astronomy

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This paper is a review on the observational Hubble parameter data that have gained increasing attention in recent years for their illuminating power on the dark side of the universe -the dark matter, dark energy, and the dark age. Currently, there are two major methods of independent observational H(z) measurement, which we summarize as the "differential age method" and the "radial BAO size method". Starting with fundamental cosmological notions such as the spacetime coordinates in an expanding universe, we present the basic principles behind the two methods. We further review the two methods in greater detail, including the source of errors. We show how the observational H(z) data presents itself as a useful tool in the study of cosmological models and parameter constraint, and we also discuss several issues associated with their applications. Finally, we point the reader to a future prospect of upcoming observation programs that will lead to some major improvements in the quality of observational H(z) data.PACS numbers: 98.80. Es, 95.36.+x, 95.35.+d, 98.62.Ai, 98.62.Py, 98.65.Dx

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“…The observational Hubble data [81,82] are based on differential ages of the galaxies. In [83], Jimenez et al obtained an independent estimate for the Hubble parameter using the method developed in [84], and used it to constrain the cosmological models.…”

Section: Observational Hubble Datamentioning

confidence: 99%

Combined constraints on modified Chaplygin gas model from cosmological observed data: Markov Chain Monte Carlo approach

et al. 2010

Gen Relativ Gravit

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We use the Markov Chain Monte Carlo method to investigate a global constraints on the modified Chaplygin gas (MCG) model as the unification of dark matter and dark energy from the latest observational data: the Union2 dataset of type supernovae Ia (SNIa), the observational Hubble data (OHD), the cluster X-ray gas mass fraction, the baryon acoustic oscillation (BAO), and the cosmic microwave background (CMB) data. In a flat universe, the constraint results for MCG model are, b h 2 = 0.02263 +0.00184 −0.00162 (1σ ) +0.00213 −0.00195 (2σ ), B s = 0.7788 +0.0736 −0.0723 (1σ ) +0.0918 −0.0904 (2σ ), α = 0.1079 +0.3397 −0.2539 (1σ ) +0.4678 −0.2911 (2σ ), B = 0.00189 +0.00583 −0.00756 (1σ ) +0.00660 −0.00915 (2σ ), and H 0 = 70.711 +4.188 −3.142 (1σ ) +5.281 −4.149 (2σ ).Keywords Modified Chaplygin gas (MCG) · Unification of dark matter and dark energy

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Cosmological constraints from radial baryon acoustic oscillation measurements and observational Hubble data

Cited by 18 publications

References 56 publications

Testing the phenomenological interacting dark energy with observational H(z) data

Testing the phenomenological interacting dark energy with observational H(z) data

Constraints on the Dark Side of the Universe and Observational Hubble Parameter Data

Combined constraints on modified Chaplygin gas model from cosmological observed data: Markov Chain Monte Carlo approach

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